Toy Hauler Cargo Dimensions "C/S" and R/S" - what?

ramgunner is correct.

If you look at this image of a Rag'n 20CBX

You'll see the wall space on the R/S (driver) is shorter then the C/S (curb/passenger side). So if you're hoping to load a wide rig all you'll have is 6'2 of space unless its able to fit within the sink cabinets then you can go up to 14'11 without an obstruction. Knowing the space from the curb side to the cabinets would be even more helpful.
Cargo R/S 6'-2"
Cargo C/S 14'-11"