I agree with the spring shop. Put the camper on and hook up the trailer. Go for a ride with the minimum about of air in the airbags and see how it is.
We used to have a 4000# Lance on a GMC CC Dually 4x4 with stock suspension and pulled an 8000# Sea Ray with no additional springs or airbags. It was a tough stable truck and worked very well but rode like a lumber truck.
After the first ride if its sagging in the back add air to the airbags until the truck is just about to come off the overload springs. You want the truck on the overloads for side to side stability. Take another ride, if its level and stable side to side you are good to go. If you have a lot of sway then its on to the heaviest sway bar you can get.
Airbags have their place and can work very well, if properly used.
Good luck.
Rick
