Air bags will take a big load off the springs. My camper is only a 20' but when I put a heavy steel stock rack and 4 llamas in the bed of my Dodge 2500 long bed and hang the camper behind it, it sags. The air bags will raise the hitch almost 6" and the frame at the axle about 4".

“In a time of deceit telling the truth is a revolutionary act.”
― George Orwell

It's not over when you lose. It's over when you quit.