2010 (?) Polaris Ranger 800.
Had two Polaris ATV's that we were pretty happy with, so when the chance came to pick this unit up a good price, we jumped on it.
Don't use it for RV/Camping at all (it's in Alaska) but it is the primary method to get to the cabin if the weather is too bad for the -12. Have used this (plus trailer) to haul in supplies and materials sufficient to replace windows, repanel interior, add a deck, and build a new outhouse.
As noted previously, the real $$ comes not in the purchase but in the accessory game. We upgraded the winch (1500# - 3000#), added a cab, built a rack, and bought tracks for it. It's a bit slow, but with the tracks it can go anywhere winter or summer except for the swamp and straight up the mountain.
In my younger days, I'd take a 4-Wheeler in more gnarly places than the SxS will go, but now, if the SxS won't get there, I'll either walk or not go.