Class A motorhome, trash the motorhome, relocate driver station, build a bannana or a weiner or broccoli or whatever body to go on top.

This is basically how they built the wienermobiles except they were starting with stripped chassis not a "ran when parked, free if you haul" tier winnebago.

Speaking of wienermobiles, I think it's a travesty they never made Heinz ketchup bottles to tow behind them.