We've had a couple, a bigger motorhome type thing which was comfortable to live in but horrible to drive or to try and squeeze down country lanes. We swapped to a Mercedes based van conversion which was beautiful to drive and still liveable in, except when the dog got bigger but now we have none and have returned to camping.
If you buy one, you have to use it, especially an expensive one. If it's for occasional use a Bongo or similiar and a tent is a perfect combo, though when you get to four of you using it, you may need a trailer as well, not much storage.