What do you have now? Just get the fam out and have fun, that is cheap. Now to answer your question try these, all used of coarse. and for $9k you most likely will have to do some work on them.
Ford e350 4x4
21 foot RV (good luck finding 4x4 but they are out there).
Toyota Sequoia, LC100, LC200, and pull a trailer.
Full size crew cab pickup with bench seats and a slide in camper and a chase vehicle, like a klr, gs, or dr. could be fun for you not being in the truck. Haha.
Nissan Armada
warning more than $9k
I say go with the RV you don't need 4x4, or just tow some crew cab SxS (rhino, ranger, razor, ect.) believe me you don’t need 4x4
Just getting past the touron season up here, I see RVs in the most random places all summer, but they are mostly rentals. Funny thing is the Manns, Moggs and other large euro 4x4 campers are never far from the tarmac.