Back to the original question, I have seen a truck here in CA with a ramp type system that the cart was at an angle just past the 5th wheel and going up the cab. If memory serves it looked like the cart was topless so it would not be any higher than the top of the 5er. It looked like the ramps went right around the 5th wheel hitch.
Stuff like this is like building a race car.
Q: How fast can it go?
A: Whats your budget? Can you weld?
A rainy day camping is better than any sunny day at work
2004 F250 V10 SD Xcab 2011 Wildwood T26BHXL