Those weights have nothing to do with payload capacity BTW. You probably are overloaded on payload.
And those suggesting a toy hauler are obviously not educated with OHV riding. There are many places to go ride away from camping areas, how would the OP get both quads to the staging area? Many, many staging areas will not support a RV by way of there is not enough space, think Moab as one example.
The DiamondBack tonneau cover is the best solution, bar none for two quads while being able to tow a TT. OP, keep in mind also that your kid will not be on a 50cc for too long which means upgrading the bike to a larger and heavier one. 3/4 ton + with DiamondBack cover safely covers your options.
I have a DiamondBack on my 1 ton diesel LB and love it. However, my TT is a 9500 lbs GVWR.
