What do you need in your vehicle beyond that it can be towed behind your RV?
If you're interested in off-road use, a Jeep is a very good option. If you're more interested in something to go into town or to go do typical touristy sightseeing with, some sort of a towable generic car might be more suitable (better milage, more comfortable traveling, possibly less expensive, more interior space...)
Most people here will tend to say that their own choice is the best possible oneโand maybe it is, at least for their needs and wants, but it may not be for yours.