Now I am not sure what modifications, if any, are needed for the 3500.
Your dealer's advice was good. Rams work very well with airbags. However, it is important that the air lines to each bag is independent and not connected to each other. I use Energy Suspension overload bumpers and air the bags to the point where the overload spring just touches the overload bumper. The ride is very stable around corners, in wind, passed by trucks, etc with an approximately 4000 pound camper. Also, be certain your tires are at a high pressure to eliminate any sway, also. Of course, and it goes without saying, if you
really want a stable ride purchase a truck with training wheels.
