This is actually possible, although the tilting to turn and such would likely fail and just make you land on your side. The Ball in the vehicle menu actually has mount points, and works on above the same principle. The only problem, as also referred to above, is keeping balance so it can roll and such and be able to be set back on it's side without respawning.
Player camera should be fixed to the top of the wheel and spin with it to make us dizzy and give it the FUN factor.
There is a camera setting for this. It either keeps the camera constantly level, or lets it roll with the vehicle. However, to let it roll with this type of vehicle forces the moment controls to cycle every time the camera flips. Very uncontrollable.
I think...
