Maybe for the space of each vehicle,
Jeeps hold 5 people
RVs hold 10 people
Pick ups hold 6 people
Jeeps are a bit bigger than sedans, so maybe 1 more person?
RVs, they're like a bus. Is there a way it could be like an actual mobile home, where you could sleep or eat, press shift and not fall out?
Pick ups have a big space in the back, and if you shot from it, it wouldn't damage the car. 2 people up front, 4 in the back. I think that's an ideal lay out.