the integrated interior side reinforcement and interior trim panel of this invention may be used on the vehicle 101 shown in fig1 to 3 . the vehicle 101 has a chassis 102 with a driver &# 39 ; s cab 103 engaged . if the vehicle 101 is an over the road type vehicle in which the drivers may need on the road rest , the vehicle will have a sleeper compartment 104 engaged to the cab 103 and chassis 102 . the sleeper 104 has an integrated interior side reinforcement and interior trim panel 119 . there is a panel in a similar shape on the opposite side of the sleeper 104 . interior cabinets 118 or furniture such as sleeping bunks may be mounted directly to the integrated reinforcement and interior trim panel 119 . the integrated reinforcement and interior trim panel 119 is shown in fig4 to 6 . the panel includes a metal interior structural panel or shell 122 that is pressed into a shape that includes structural sides 123 . there may be a support channel 127 . there are plastic injection molded z - shaped reinforcing and support ribs 121 that ideally are injected through holes in the metal structural panel 122 . the ribs 121 are formed in zigzag pattern about the reinforcement and trim panel 119 . where there is a support channel 127 , the reinforcing and support ribs 121 may be engaged along and across the support channel 127 with engagement at discrete engagement locations 128 along the support channel 127 . these discrete engagement locations 128 may correspond to plastic injection points for the injection mold . the metal of the interior structural panel may be zinc - coated steel sheets and / or steel sheets provided with a primer and optionally adhesion - promoter , untreated , anodized aluminum sheets and / or aluminum sheets provided with a primer and optionally an adhesion - promoter are particular suitable . partially crystalline plastics , such as glass - fiber reinforced polyamide 6 , polyamide 6 , 6 , polybutylene terephthalate , polyphenylene sulphide or propylene are suitable as plastics for injecting in the reinforcing ribs 121 . this design provides strength to the metal interior structural panel 122 without the additional weight that a traditional separate metal reinforcement would have provided . weight is an important issue in tractor - trailers in applications where the vehicles operate at their legal limit . if 80 to 100 pounds may be removed from each sleeper side panel , then the driver may carry an additional 160 to 200 pounds load and since some contract payments are determined on the basis of weight , the use of this invention may save drivers and fleet managers considerable amounts of money on an annual basis . the reinforcement and trim panel may also include an integrally injection molded interior trim surface 125 . cabinets 118 and other sleeper furnishings may be mounted to the interior trim surface 125 given the strength emboldened upon the reinforcement and trim panel 119 from the reinforcing ribs 121 and metal interior structural panel or shell 122 . fig7 is an exploded view of a second embodiment of an integral interior structural and interior trim panel 219 along with an exterior panel 211 and interior trim cabinets 218 a and 218 b . the exterior panel 211 may contain openings 231 for either windows or access areas . the structural and interior trim panel 219 needs to have corresponding openings 231 a . under the prior art the extra supports in the structural panel would have been made of metal and there would have been a significant increase in panel weight . in this invention , there is a significant weight reduction due to the use of plastic - metal hybrid materials . the structural and interior trim panel 219 has a generally hollow sheet metal support frame 223 that runs around the sides and upper portions of the panel as well as adjacent to the openings 231 a . there are support channels 227 a , 227 b , 227 c , 227 d , and 227 e . the support channels 227 a , 227 b , 227 c , 227 d , and 227 e contain reinforcing and support rib matrixes 221 a , 221 b , 221 c , 221 d , and 221 e . these support rib matrixes 221 a , 221 b , 221 c , 221 d , and 221 e may be made of zigzagged plastic material that provides bracing and support to the support channels and the structural and interior trim panel 219 . the structural and interior trim panel 219 may include an interior trim surface 225 that provides a high quality inner wall surface for the sleeper 104 . cabinetry or other interior furnishings 218 a and 218 b may be mounted directly to the inner surface 225 of the structural and interior trim panel 219 using conventional fasteners 226 through mounting holes 226 a . once again the metal and plastic of the structural and interior trim panel 219 may be formed together using a prior art plastic - metal hybrid injection molding technology . referring to fig8 , 9 , 10 a , and 10 b , the invention entails integrating the side reinforcement piece 319 a with the side inner molding trim piece 319 b . the side outer panel 311 would be engaged to the integral side reinforcement piece 319 a and side inner molding trim piece 319 b . the sleeper 104 could be assembled with the side outer panel 311 and the integral side reinforcement piece 319 a and side inner molding trim piece 319 b being engaged to both the sleeper floor assembly 321 as well as the sleeper back assembly 322 . additionally , the design may include integration of a foam exterior 339 on the outer side of the reinforcement piece 319 a . this foam 339 on the integrated sidepiece will provide sound dampening as well as thermal insulation for the sleeper unit 104 . the integration of the foam 339 to the outer portion of the reinforcement 319 a allows structural support for this sound dampener and thermal insulator . the integration allows single piece installation during sleeper 104 manufacture . another embodiment of an integrated reinforcement and interior trim panel 419 is shown in fig1 . the reinforcement and trim panel 419 has an inner trim surface panel 425 and a crosshatched rib matrix of alternate direction ribs 421 a and 421 b . the reinforcement and trim panel 419 and alternate direction ribs 421 a and 421 b are comprised of a plastic . there are also integrated metal support pieces 423 a and 423 b and window or opening frames 431 a and 431 b engaged to the reinforcement and trim panel 419 and the alternate direction ribs 421 a and 421 b . the integrated metal support pieces 423 a and 423 b and window or opening frames 431 a and 431 b may be engaged to the plastic coating by an injection molding process such as a plastic - metal hybrid process . as described above , the sleeper panel design of this invention and the vehicle 101 with the sleeper panel installed provide a number of advantages , some of which have been described above and others of which are inherent in the invention . also modifications may be proposed to the sleeper panel design of this invention and the vehicle 101 with the sleeper panel installed without departing from the teachings herein .