I had a 2008 Turtle Top Van Terra on a Ford E350 Super Duty that I got for 10K and a few years later sold for 22K. It only got around 15 mpg and we were wanting to do some longer trips was the only reason I sold it. Now I wish I hadn't sold it. The nice thing is you can put a queen either direction, install a really nice shower and separate toilet and have a full kitchen and lounge and still have space. BTW, I probably put 10K into it outfitting it, but it was the most comfy setup ever. If you have the time, DIY is a great way to get what you want.