I have a Dodge Grand Caravan and I used to be able to get 2 or 3 in comfortably with all the support gear, drink cooler, pop up cabana and a folding seat. I have progressively gone up in size and with 40% scale aerobatic stuff and 1/5 scale warbirds, I have less and less room for the extra stuff. I am considering going back to smaller planes, to me they're less hassle and I didn't have to fiddle with them as much as I do with the bigger planes.
Just My Two Cents!
Loopman