Welcome to the website! You'll find a lot of good information on here from folks that know!
I don't have a lot to add, but in the past I've also used a rubber mat. In my current truck I have a Linex spray in liner that is rough, like sand paper. I know some folks disagree with this method, but I've never had a problem with movement in my last camper; a 4,000lb Weekender. I have no airbags, but I do have Rancho 9000 adjustable shocks.
When I was solo I too lived in a fiver (9 years full time.) I rented out my house and had a great time traveling with it and then purchased a new camper to add to the fleet at the time. I found I used it a LOT!... Now in a stick house again I will ALWAYS have a truck camper. That is as long as I can drive!
Good luck in your search and see ya down the road! :)
Dak