Back hurting from bed in travel trailer - need advice please

+2 on the Froli.

Here's a link to their web site:

http://www.nickleatlantic.com/

Here's a review of the system on Truck Camper Adventure:

http://www.truckcamperadventure.com/review-of-the-froli-star-sleep-system/

I use the Froli with a latex foam mattress I bought from The Foam Factory:

https://www.thefoamfactory.com/

Lots of useful information there about foam grades, foam density, etc. and you can buy whatever grade and density you want, rather than buy something with just a brand name and no idea what you are really getting.