I thought this was an interesting looking camper. I am not sure how the durability would be. http://casualturtlecampers.com/ I don't know how to do the clicky thing, sorry.
When looking at an RV, I'm looking for long term durability. I don't see that lasting 40 years or more, especially in the AZ sun. With it's limited space, I would rather have a pop up camper. I'm sure it would fit some folks needs, but it doesn't work for me.