Improve my suspension

Thanks Jimln My Durmax is rated for 22000 lbs Thats for a combined weight of the truck and the trailer Last I put it on the scale it came in @ 22500lbs and I had fluids in the tanks We also emptied some items So long story short we are well within the GVW of the vehicle Weights I believe the fifth wheel pin weight for the trailer is at about 1750lbs What started my whole search was we just moved are fifth wheel on a 1100 mile trip We came home without it We felt great when we got out of the vehicle running without the fifth wheel. With the fifth wheel stiff and sore for the first few steps getting out for fuel We have traveled from Florida Keys to Alaska so lets just say I've hauled the fifth wheel over 50000 mile on various trips
I'm liking the airbag suggestion Thanks again Jimln