One time, I had six people, a PA, my bass rig and a drum set in my old Econoline. If it had had conventional benches and not "Captain's Chairs" I would have been able to fit a lot more.

It's all a question of what you can find and how good you are at arranging things within a confined space.

so you play a lot of tetris as a kid?
dunno bout the vans in america but over here they are generally either transits or car vans (poneyone call em panel vans? basically an estate car with no back seats or windows.)