[bennelson]

That's another possibility of a truck like this is that the box could be completely removed.

One COULD simply build a custom, from-scratch, RV/Camper/MobileHome on it. As such, aerodynamics could be improved, or a bed could stick out over the cab, or the whole thing could be covered in cedar shakes - however a person wanted to design it!

Straight trucks are just an engine and frame, so anything is possible.

Having that solid straight frame would also make it easy to add outside storage boxes that mount below the deck - like the suitcase compartments on a touring bus.

Lots of possibilities.