What's a "Multivan"?

I've found someone selling a 1990 and I don't know what it is. It has
a pop-top, no stove or sink. I haven't seen it yet, but I do know
it's spendy: retail book range is $10,500-16,500 USD.

Thanks,
Dave
--
Dave Carpenter

"Just as great human interfaces can make novices perform like
experts, badly designed systems can make intelligent, skilled people
look like idiots." -- Peter Bickford