I know what I would do.
I would find an antique Air Stream camper trailer and graft it behind that cut off cab. Those old Air Stream campers are just as iconic looking as our trucks are.
It would be a spendy project, but it would be a traffic stopper.
Great idea! The old airstreams are unfortunately really popular right now and as such are commanding a premium price, even if in a trashed condition. If the OP didn’t want to spend too much, he could just buy a older trailer, in decent shape, then graft it on.