Adjustable single rail stand unit
FIG. 1 is a perspective view of an adjustable single rail stand unit showing my new design; 
     FIG. 2 is a front elevational view thereof; 
     FIG. 3 is a rear elevational view thereof; 
     FIG. 4 is a right end elevational view thereof; 
     FIG. 5 is a top plan view thereof; 
     FIG. 6 is a left end elevational view thereof; 
     FIG. 7 is a bottom plan view thereof; 
     FIG. 8 is a rear elevational view thereof with wheels attached; 
     FIG. 9 is a front elevational view thereof with wheels attached; 
     FIG. 10 is a right end elevational view thereof with wheels attached; and, 
     FIG. 11 is an exploded left end elevational view thereof illustrating the wheels removed. 
     The broken line showing of a support rail is for illustrative purposes only and forms no part of the claimed design.