I am thinking of building one. It's design style will be of a Teardrop camper. I can see a lot of advantages, in doing so, things, like being able to get in it, when caught in a bad storm, something that has happened a fair few times. I hate being soaking wet and cold because of it. Being able to just pull in and sleep with out putting up the tent all the time. And cooking in it in bad weather. As I always tour with my dog, giving him something more comfortable to travel in. Being on a 4 inch mattress instead of a 3cm one on rough ground. Being a bit more safer in it, as apposed to the tent in dealing with feral dog packs, at night , which has happened twice here. I also know the downsides, like weight issues, a much bigger footprint whilst on the road, especially narrow ones, hill climbing will be much harder, more strain on the drive train, a lot more wear issues on that gear. I am wondering whether their are any other downsides that I have not thought of, Can you guys enlighten me?