referring to the drawings and particularly to fig1 and 2 , one form of the pallet assembly of the present invention is there illustrated and generally designated by the numeral 11 . pallet assembly 11 here comprises a base assembly 12 and an article support assembly 14 that is connected to base assembly 12 in the manner shown in fig2 of the drawings . as best seen in fig3 of the drawings , base assembly 12 includes a frame 16 having side walls 18 a and 18 b and end walls 20 a and 20 b respectively . provided at the juncture of the side and end walls are angularly extending wall segments 22 ( fig4 ). as best seen by referring to fig2 a of the drawings , each of the side walls includes a cover plate 24 that is removable to expose a pair of spaced apart , generally u - shaped openings 25 ( fig3 ). welded to the top of each cover plate are four inverted u - shaped brackets 26 that can be used as tie down points . the two center brackets 26 a can also be used to pick up the heavy cover plate using a forklift . connected to and spanning end walls of the frame is a plurality of spaced apart stiffener members 28 , the purpose of which will presently be described . spaced apart stiffener members 28 are superimposed over a base panel 30 that is also connected to and spans end walls 20 a and 20 b . interconnected with each of the end walls of the frame are upstanding members 32 to which connector plates 34 are interconnected ( fig3 and 4 ). connected to and spanning each pair of upstanding members 32 is a transversely extending rod 35 that functions to stabilize the upstanding members 32 . also forming a part of base assembly 12 is a plurality of ground engaging roller assemblies 36 that are connected to connector plates 34 in the manner illustrated in fig1 and 2a of the drawings . in the present form of the invention , each of the ground engaging roller assemblies 36 comprises a modified 12 , 000 lbs ( 5 , 450 kg ) capacity manually operated trailer jack assembly 38 . jack assembly 38 is bolted on top of a 13 , 200 lbs ( 6 , 000 kg ) capacity skate assembly 40 that includes four spaced apart swiveling rollers 41 ( fig9 and 10 ). welded to the body of the jack assembly is a horizontal arm 42 to which the connector plate 42 a is connected . connector plate 42 a has a plurality of spaced apart keyhole shaped openings 43 ( fig9 and 10 ) that accept appropriate fasteners that include head and threaded shank portions and function in a conventional manner to interconnect connector plates 42 a with connector plates 34 . with the construction thus described , a selected jack screw skate assembly 36 can be rolled up to a selected connector plate 34 and cranked up or down to level the larger diameter opening of the keyhole shaped openings 43 of the connector plate 44 a with the heads of the threaded fasteners . the jack screw skate assembly 38 can then be rolled forward over the fastener heads until the two mounting plates mate . the jack screw skate assembly can then be cranked up to move the slots of the keyholes over the threaded body of the threaded fasteners . the threaded fasteners can then be tightened to secure the jack screw skate assembly 36 to the frame 12 . advantageously , because of the novel design of the connector plates , when attaching and removing the jack screw skate assemblies , it is not necessary to remove the fasteners , only to loosen them . jack assembly 38 is readily commercially available from several sources including northern tool equipment company of burnsville , minn . similarly , rotating skate assembly 40 is readily commercially available from a number of sources including amital usa , inc . of monroe , n . c . the operation of these assemblies will be described in greater detail hereinafter . as best seen by referring to fig2 , 5 , 6 and 7 of the drawings , the important article support assembly 14 of the present invention comprises a lower , generally planar base plate 45 and three longitudinally spaced apart , generally planar load support panels 46 , 48 and 50 that are superimposed over planar base plate 45 and are affixed proximate their ends to transversely spaced apart , elongated right angle members 52 and 54 ( see fig5 ). disposed between panel 46 and panel 48 is a transverse space 55 and disposed between panel 48 and panel 50 is a transverse space 56 . in a manner presently to be described , the edges of planar base plate 45 are connected to base assembly 12 by means of spaced apart connecter block assemblies 57 that are affixed to planar base plate 30 ( see fig3 and 4 ). as best seen in fig7 , support panel 46 has an upper surface 46 a and a lower surface 46 b . similarly , support panel 48 has an upper surface 48 a and a lower surface 48 b and support panel 50 has an upper surface 50 a and a lower surface 50 b ( see fig7 ). connected to and extending upwardly from the upper surface 46 a of support panel 46 are four , transversely spaced apart positioning blocks 58 ( fig2 a ), the purpose of which will presently be described . connected to and disposed below the lower surface 48 b of support panel 48 are six , spaced apart , spacer blocks 49 , four of which extend transversely and two of which extend longitudinally ( fig5 and 7 ). the purpose of these important spacer blocks will presently be described . also connected to and extending upwardly from the upper surface 48 a of support panel 48 , are two transversely spaced apart positioning blocks 58 ( fig2 a ). connected to and extending upwardly from the upper surface 50 a of support panel 50 are four transversely spaced apart positioning blocks 58 ( fig2 and 2a ). connected to and disposed below the lower surfaces 46 b and 50 b of each of the support panels 46 and 50 are six transversely spaced apart , staggered spacer blocks 59 ( fig5 and 7 ). also connected to and disposed below the lower surfaces of each of the support panels 46 , 48 and 50 are four spaced apart , resilient bumper assemblies 61 , the purpose of which will presently be described . connected to each of the spacer blocks 49 and 59 and forming a part of the article support assembly 14 is a shock and vibration absorption member shown here as a resilient , energy dissipating isolator assembly 60 ( fig8 ). isolator assemblies 60 , which form an important aspect of the apparatus of the present invention , here comprise stable mounting assemblies of high quality stranded wire rope 62 held with upper and lower rugged metal retainers 64 and 64 a ( fig8 ). connector blocks 49 and 59 are affixed to the upper retainers 64 of the isolating elements in the manner depicted in fig5 and 7 . isolator assemblies 60 , which uniquely can handle both shock and vibration , have specific response characteristics determined by the diameter of the wire rope , the number of strands , the cable length , the cable twist or lay , and the number of cables per section . under load inherent damping is provided by flexure hysteresis , i . e ., the rubbing and sliding friction between the strands of the wire rope . the novel design of the isolators permits their use in any attitude . their relatively large dynamic displacement attenuates heavy shocks , while their inherent damping enables them to store and dissipate large amounts of low and high frequency vibration . further , the damping capacity of the isolators effectively dissipates energy and rapidly decays the response oscillations produced by the initial shock . by keeping the number of oscillations and their peak amplitude to a minimum , the isolators provide a highly beneficial effect on the protected equipment . advantageously , the isolators are generally unaffected by environmental conditions such as changing temperatures and corrosive media and once installed , require little or no maintenance and typically exhibit a long useful life . planar base plate 45 and load support panels 46 , 48 and 50 cooperate to define there between an internal space 68 . within internal space 68 and aligned with transverse spaces 55 and 56 are two longitudinally spaced apart transverse lift members receiving channels 70 and 72 ( fig2 a ), the purpose of which will be described hereinafter . affixed to end wall 20 a in the manner indicated in fig3 is a pair of transversely spaced apart hoist rings 74 and affixed to end wall 20 b in the manner indicated in fig3 is a pair of transversely spaced apart hoist rings 76 . the purpose of these hoist rings will presently be described . prior to loading the cargo to be transported onto the pallet assembly 11 , the number of isolating assemblies 60 of the transport pallet can be adjusted to suit the weight of the cargo and its center of gravity . this is accomplished by removing the three longitudinally spaced apart , generally planar support panels 46 , 48 and 50 from the article support assembly 14 and then removing from the panels the spacer blocks 49 and 59 that engage each isolating assembly 60 that is to be rendered inactive . to prevent accidental loss of the spacer blocks , they can be bolted to the end of the base panels 45 using taped holes provided for this purpose . in order to adjust the transport pallet in an alternate manner to accommodate various cargo weights , spacer blocks of different selected widths can be connected to the isolating assemblies , thereby adjusting the resilience of the energy dissipating isolator assemblies . next , the article support assembly 14 is re - secured within the base assembly 12 using the previously identified connecter block assemblies 57 . in this regard , each connecter block assembly 57 here comprises a connecter block 57 a and a strap clamp 57 b ( fig4 ), which is pivotally connected to the top of the connecter block and which functions to secure the article support assembly in position . more particularly , with the article support assembly 14 nested within the connecter block assemblies 57 , the strap clamps 57 b are rotated 90 degrees to cause them to be moved over and into engagement with the generally planar base plate 45 of the article support assembly 14 . with the article support assembly 14 re - secured within the base assembly 16 , the transport pallet can be positioned to enable the cargo to be safely loaded onto the article support assembly 14 . while the particular method to be used to load the cargo onto the transport pallet depends on the nature of the cargo , typically the cargo is raised by any suitable means of a character well understood by those skilled in the art and the transport pallet is rolled under the elevated cargo . to provide for maximum stability of the transport pallet during cargo loading , the frame 16 of the base assembly 12 is lowered to the ground through use of the four jack assemblies 38 . this step is accomplished by first connecting a suitable crank handle 80 to each of the drives 38 d of the jack assemblies ( see fig9 ). this done , using a person stationed at each jack assembly , the jack assemblies are simultaneously lowered by controllably rotating the crank handles . preferably , during this step , one person will count out loud the number of revolutions of the crank handle so that all four people stay at the same revolution , thereby keeping the load level equal . as illustrated in fig2 , as the cargo is lowered into position , the previously identified positioning blocks 58 which are mounted on the upper surfaces of the planar support panels , function to strategically locate the cargo within the article support assembly 14 . to secure the cargo within the article support assembly 14 , conventional clamp down type restraining assemblies 82 ( fig1 and 2 ) which are also mounted on the upper surfaces of the planar support panels , are provided as may be required . in practice , the positioning blocks 58 and the restraining assemblies 82 can be moved to different locations on the support panels to suit various cargo dimensions . with the cargo loaded onto and secured to the transport pallet , the frame 16 of the base assembly 12 is controllably raised by the four persons stationed at each jack assembly simultaneously rotating the crank handles in a frame raising direction . prior to loading the transport pallet into the transport vehicle , the rigging crew must create a level transition across the gap between the transport vehicle and the loading dock . this is normally accomplished with large steel and plastic sheets that are taped to the floor of the loading dock . after determining the estimated overall weight of the loaded transport pallet , the vehicle operator must determine the exact position of the loaded transport pallet within the transport vehicle and prepare the necessary tie down equipment needed to secure the cargo . because of the weight of the cargo , which , in some cases can exceed 22 , 000 pounds , industrial class fork lift trucks are required to move the loaded pallet toward the transport truck . the forklift can be suitably connected to the hoist rings 74 of the base assembly with the chains and load binders of a conventional nature so that the forklift can pull , push , and steer the cart as may be required . similarly , a pair of hoist rings 75 are provided at each end of the base assembly to enable the assembly to be lifted using forklifts or other lifting equipment ( fig4 ). using an appropriate fork lift truck , the forklift driver will maneuver the loaded pallet cart until it is lined up for a straight entry into the transport vehicle . to prevent damage to the transport vehicle , an adjustable rigid caster 86 is provided on each of the angularly extending wall segments 22 located at each corner of the cart . as shown in fig2 of the drawings , casters 86 extend past the long side of the base assembly 12 so that they will contact the inside walls of the transport vehicle to help guide the assembly and prevent the sides of the assembly from damaging the walls . casters 86 can be readily adjusted to accommodate transport vehicle openings of various widths . after verifying that the casters 86 are correctly mounted so that they will safely enter the entrance to the transport vehicle , the forklift driver can push the cart into the transport vehicle to the tie down location . with the transport pallet properly positioned within the transport vehicle , the frame 16 of the base assembly 12 is lowered to the floor of the transport vehicle through use of the four jack assemblies 38 in the manner previously described . removal of the cargo from the pallet assembly at the cargo destination can be accomplished in two ways . in one case the cargo can be removed directly from the pallet assembly and lowered onto the air bearings or dollies that can be used to move it to its next location . alternatively , the cargo can remain on the article support assembly of the transport pallet , while the article support assembly along with the cargo is lifted from the base assembly . in this case , the article support assembly along with the cargo can be lowered onto air bearings or dollies and moved to another location where , at a later time , the cargo can be lifted from the article support assembly . in the instance where the article support assembly along with the cargo is removed from the base assembly , it is necessary to remove the cover plates 24 from the frame 16 to expose the previously identified pair of spaced apart u - shaped openings 25 . as previously mentioned , center u - shaped brackets 26 a can be used to pick up the heavy cover plate using a forklift and the four inverted u - shaped brackets 26 a can be used as tie down points . with the cover plates 24 removed , two elongate lifting bars 90 are first inserted through the transverse lift member receiving channels 70 and 72 so that an equal amount of each lifting bar protrudes from each of the side walls 18 a and 18 b of the frame 16 ( see fig1 ). this done , a specially designed lifting fixture 92 is connected to each of the protruding ends of the lifting bars in the manner indicated in fig2 a of the drawings . next , four readily commercially available battery operated mobile column lifters “ cl ”, such as column lifters of the character available from stertil - koni of stevensville , md . and sold under the model designation “ st1082 ”, are mated with the lifting fixtures 92 and then used to lift the lifting bars . more particularly , a selected one of each of the four column lifters “ cl ” is first rolled into proximity with one of the lift fixtures 92 and then the lifting member of the column lifter is telescopically mated with the lift fixture 92 in a manner well understood by those skilled in the art ( see also fig1 ). preferably , each of the four lifters should be engaged with its respective lift fixture until the base of the column lifter is approximately one inch from the side of the frame 12 . with the column lifters mated with the lifting fixtures 92 the base plate 45 of the article support assembly 14 can be disconnected from the base assembly 12 . this is accomplished by rotating the strap clamps 57 b , of the connecter block assemblies 57 , 90 degrees to cause them to be moved out of engagement with the generally planar base plate 45 of the article support assembly 14 . this done , the column lifters can be energized to controllably lift the article support assembly 14 along with the cargo from the base assembly 12 . with the support assembly 14 in an elevated position , the base assembly 12 can be pulled from beneath the support assembly 14 . then , using the column lifters , the article support assembly 14 along with the cargo can be lowered onto blocks , air bearings or dollies that are of a sufficient height to permit withdrawal of the column lifters and removal of the lifting bars from the article support assembly . it is to be understood that rather than using column lifters of the character described , lifting and lowering of the article support assembly 14 along with the cargo can be done with a large ( 30 , 000 + lbs capacity ) forklift truck and a skilled driver . in such case , the forks of the forklift truck , rather than the lifting bars , are inserted into lift member receiving channels 70 and 72 and the forks of the forklift truck accomplish the lifting operations in a manner well understood by those skilled in the art . as depicted in fig1 and 13 of the drawings , when the transport pallets 11 are not in use they can be conveniently stacked for storage or shipment in the manner illustrated so that each assembly rests upon the upstanding members 32 of the assembly immediately beneath it . having now described the invention in detail in accordance with the requirements of the patent statues , those skilled in this art will have no difficulty in making changes and modifications in the individual parts or their relative assembly in order to meet specific requirements or conditions . such changes and modifications may be made without departing from the scope and spirit of the invention , as set forth in the following claims .