What Kevin said. I installed factory overloads on my 3600. They work Great for loads. The down side is the flatbed on my truck is just heavy enough to cause the overloads to engage frequently when on rough potholed roads, riding like the proverbial log wagon. The wife's living quarters horse trailer and Lance cabover camper hauling 2500 Ram has air bags. They're great, except one has started leaking down and I've been too cheap/lazy to swap it out.
One alternative I'm considering on the wife's truck and that would be a good option for yours
Trebin is Timbren or
SumoSprings Airless Air BagsA lot of folks hauling cabover campers (bed weights of 2,500lbs to 4,500lbs are common) perfer the overloads systems above to air bags. Zero maintenance being the big plus.
Of course you could cancel your new springs that are on the way and have a spring shop build a set of springs for your particular situation (with the higher loads mentioned in mind) according to other members here, not expensive at all.
Good Luck,
RonR
