2001400ex,
#1 - You have a real problem with air bag installation
#2 - Your trailer is pretty "nose" high - you may not have enough hitch adjustment to level rig and keep your 6" minimum gap
#3 - Your tire man is an IDIOT!!!!
#4 - I don't think (at least from picture angle) that you can change hitch set up... You want to maintain your pin weight position at axle vertical centerline or just forward of centerline.
Did your rv dealership install bags, hitch, and determine that all was well.... If so, see #3
Also....consider having bags connected together so they are always at equal pressure. Makes life much simplier!
You mentioned lowering bag pressure and the trailer was better leveled. If so.... Is your truck "now" nose high.
? If you drive at night, you will not make any friends in the opposing lane!
Last but not Least... It truly does appear that raising the trailer (flipping axles or whatever means necessary) will likely be needed!!
The "only" reason that a dealer like yours are still alive is....they are a "Protected Species"