Opinions on air bags for 2015 HD 3500 to carry my Lance 855s

I recently purchased a 2015 Lance 855s and carry it on a 2015 GMC 3500 SB SRW 4x4 truck. It sits level and rides good but the headlights are a little high and I prefer a slight forward rake. I experimented last Saturday with the upper overloads by inserting chunks of 2x4 between the upper overloads and the perches. Currently the camper barely engages the upper overloads. The 1 1/2" of wood raised the rear of the camper a full 1" and improved the ride and handling with less side sway on turns. (the DW and I took it for a one mile spin around the neighborhood and she liked the improvement as well)I have upper Stable Loads on order as the gaps between the lower overloads and the main spring pack on this GMC are too small when unloaded to allow all of the lower stable load leafs to be utilized. The truck is a dedicated camper hauler for now so ride quality when empty is of a lesser concern. I agree that you should get the camper, load it and drive it first before doing anything to your truck suspension wise. Have fun with your 855s!