I have a 1996 Tioga Montaro 28 on a Ford E350 chassis. I have Bilstein shocks and air bags. How do you tell if your springs are bad? Every time I go over an expansion joint or bump it sounds terrib...
As "Fiverwheel" states, weigh your rig. Only enough air pressure in your tires to carry the weight. Your tires are a part of your suspension just like the springs, shocks, and air bags.