Posted 14 April 2017 - 09:51 AM
The payload sticker on the door jam is the one takes in account the truck classification weight limit, options selected and actual weight of the truck. The sticker in the glove box just takes that computed payload minus the number of seats available @ 150 lbs each. There has never been a reference I could find that denotes load height derating payload although I will not argue that stability is decreased as the height is raised.
My F250 was optioned with the camper package wich gave it the upper overload spring and rear stabilizer bar. It ran the the upgraded 18" wheels for more tire capacity and was later upgraded again to 19.5" since I was running within 50 lbs of each rear tire maximum when I loaded everything up. I used both the upper StableLoad pads and lower StableLoad wedges to carry my 4000 lb camper - This was about 7000 lbs on the rear axle. I had an additional 1000 lbs of tongue weight from my enclosed trailer and used Firestone airbags inflated to 50 PSI to compensate for that additional hitch weight on the extension. Although I could pack the camper and trailer to stay under 7500 lbs on the rear axle, I was typically closer 8000 lbs after I went the 9000 lb rated 19.5" wheels.
My 5500 currently has no suspension upgrades, but I expect to be carrying 2000 more lbs with the Host filled with supplies and water. I have upper StableLoads awaiting install if I get too much rear sag once completely loaded, but with the Arctic Fox and trailer I was barely touching the overload springs and still rear high.
Firestone sells two different air bag kits. One kit sits on top of the leaf springs and attaches to the side of the truck frame rail. The second kit sits on the axle bump stop and replaces the frame rail bumper. The latter kit has less suspension travel but is used when gooseneck or fifth wheel hardware interferes with installation of the first kit (may also be needed based on the helper springs you install). Although I had no problems with my Firestone bags (mounting hardware was too soft grade and replaced), I would probably choose another brand that has built in bump stop so you do not need to maintain a minimum pressure in the bags to prevent wear damage.
2012 Interstate Car Carrier ICC10220TA3, 20'x8.5', 8" I-beam frame, dual 5200 lb 4" drop torsion axles, Diamond plate, Towmax 225/75R15 LRE tires on galvanized rims, Harbor Freight 10k lb equalizing hitch, Camping World vent cover, LED lighting, 3' RV door, front and rear door interior light switches, interior plywood walls and floor, 70' of Harbor Freight E-track rail with recessed corner 5k lb D-rings, Dual 42 gal fresh water tanks with Harbor Freight transfer pump, portable dual Harbor Freight 45w solar arrays, 100 lbs LPG in four bottles, PowerArmor Max Solar 5-battery box, Deka 24HR3000 sealed batteries
2015 Ram 5500 HD 4wd Tradesman 60" CA, Crew cab with 173.4" wheelbase, 19,000 lb GVWR with 26,000 lb GCWR, Cummins I6 6.7 liter diesel with chassis cab tune 325 hp @ 2800 rpm and 750 ft-lb @ 1700 rpm, Aisin AS69RC 6-speed automatic, New Process NV271 manual transfer case, 14.5k lb Dana S14-111L limited slip and 7250 lb Magna Steyr 275mm with 4.44 ratios, Palfinger Badger low sill flat bed, Dual DeeZee 36x18x18 under bed boxes, Quad DeeZee 48x18x18 above bed boxes, Curt Double Lock 30K lb gooseneck, Dual 3/4" horse stall mats, SuperHitch Magnum 30K dual receiver with 42" SuperTruss, Upper StableLoads, Short range FastGun turnbuckles with locks
2018 Host Mammoth 11.5, Polarized dual pane windows, Powered and lit awning, Swing out Rieco-Titan jacks, Fantastic Fan in cab over, Aero-Flo vent covers, 3x160w Zamp Solar with 30A controller, External 24" TV with DVD, Cargo slide tray, dual 6-volt batteries, 2.5KW LPG Onan, External LPG connection, 2-way water heater, Therford 3-burner cook top, Convection/Microwave, 8 cu ft 2-way Norcold Fridge, Loveseat with foot rest, U-shaped dinette, 1000W PSW Zamp inverter, King Jack amplified OTA antenna, 40" Samsung UN40J5200 smart TV in living room, Electric fireplace with heater, Accordion bedroom door, Full wall passenger-side cab over wardrobe, 32" Samsung UN32J5205 smart TV in Bedroom