is configured to mountingly receive various rack accessories fig3 for example shows cargo cage 152 mounted on top of cargo carrying system 100 also by way of example fig7 shows a non rigid canopy 230 mounted over cargo car ring system 100 creating a barrier between the environment external to the cargo carrying system 100 and the inside of the cargo carrying system turning our attention to fig5 7 a second cargo carrying system example cargo carrying system 200 will now be described cargo carrying system 200 includes many features similar or identical to cargo carrying system 100 thus for the sake of brevity each feature of cargo carrying system 200 will not be redundantly explained rather key distinctions between cargo carrying system 200 and cargo carrying system 100 will be described in detail and the reader should reference the discussion above for features substantially similar between the two systems as can be seen in fig5 and 6 cargo carrying system 200 includes a cross support 210 a mounting bracket 218 an adjustable height vertical leg 212 a coupler 220 and an adjustable length central member 216 the components of cargo carrying system 200 differ slightly from those described in association with cargo carrying system 100 with respect to adjustable height vertical leg 212 and adjustable length central member 216 automotive cargo beds vary in width and height relative to one another in order to overcome these discrepancies and for more accurate fitment of cargo carrying.