Has anyone got or used a Boot Jump from Amdro http://www.amdro.co.uk/products/boot-jump-camper-car-c-10_15.html
I think they are a great idea although maybe a little expensive as I have built something similar myself and it didn't cost anywhere near the price of this, but still think it's good
Video
https://youtu.be/4TIuUfylVRI?list=UUh24wCKKtzpuq0RXgOod4hA
I have one and love it. My son and I have just come back from 4 days at a music festival in ours. Amdro is good quality build, well-designed, and has good customer service, in my experience.
Amazing family weekend with old steam engines, classic car displays, market stalls, and full catering and bar. And camping on site - Save £25 by booking in advance.