I had a 2004 dodge 3500 DRW 4X4 W/ Okanagan db96 ,10`1`` w/ slide
just put supersprings on it , it had upper overloads so the supersprings went over them and worked in comb with the overloads , you could adjust them by the shackle type plates at the end of the suppersprings, loaded great , unloaded and unengaged a little harsher.
I kept my 99 2500 dodge diesel 4x4 and have had 4 campers on it , 2 northstar pop ups and a outfitter apex 9.5 and now a Lance 500 legand thats more twards the limit , I have air bags and upper overloads , the air bags suck the larger the camper , they just add pogo even at 10 lbs , I lowered the bumpstops on the over loads and that helps ,the truck sits level fine and rides ok , but still rolls a bit .
So I have decided my next move is to quit fooling around with add on stuff and just put the leafs on that will handle the weight without all the endgadging and unengadging that you have with multable spring packs w/ overloads
General Spring sells 4000lb 8 leaf spring packs that are progresive, no bottom overload, for 180.00 each direct bolt on , like what comes on cab &chas trucks .Ive been told you can remove 1 or 2 leafs if you want and end up at about 2850 each . My truck already rides ruff , I have d25 front coils and dual bilstens in front ,bilstens in rear. It might cause need of dental repair riding unloaded but I bet, or hope it rides well loaded