Hi! Looking at a few used roadtreks, one is 92 roadtrek 210 independent. The other van is a 95 Dodge Ram 3500 V8 magnum. I've read a bit, but mostly I am still in the dark as to the quality of older...
You could add front seat swivels, and build something to span the gap, then add a piece of of foam over the top. That's where Roadtrek puts their small bed.