I confess to owning a raclet railer tent. I got it after selling my bedford camper, the bedford was beautiful but it was a pain, drank fuel and having to clear everything up everytime you needed to drive to the shops just broke me down in the end. I even had enough cash spare afterwards to get myself a couple of kayaks.
The trailer tents a bit colder but you're sleeping off the floor anyway so I'm usually pretty snug. It's also HUGE inside, so if it's raining there's actually space for the kids to play without them getting in the way., I don't miss the van and it's mot, tax and mechanical problems.