You’ve already read what I have to say about suspension mods. Your truck is already set up to take the load, as you chose well. AFAIK, the ’17 Ford 350 has enough fender clearance to take 35’s without rubbing. Does the DEF tank hang down below the frame rails? This is crucial. I only did a 3″ lift to gain tire clearance as our truck campers are tall enough without much lift. The woe is keeping the overall height as low as possible with as much approach, breakover, and departure angle as you can muster. My bro John has a 1999 F-250 with Camper package (upper overloads) long bed with standard size tires and he’s been able to go anywhere I go. Of course, he won the first, “King of the Hammers” off-road race and an especially gifted off road driver, so that plays into the equation on how he can motate over really ugly terrain without a scratch. Bro John’s Ford does sit lower in back even with the upper overload spring. So maybe try a 1800-2K pound helper spring in the pack on the rear. It’s a cheap fix and has the plus of giving you a tri-load feature with about a 2″ loaded lift over stock. I have this one, and when the truck is empty I basically ride on this spring. It’s not a bad ride, but not good either. With 500 pounds of load the susp. gets down to the regular spring pack and gets noticeably stiffer. With the 2350 pound camper on, the susp. descends to the Stable Loads, overload single, and 3 upper overload giving a firm but very stable ride. The ride has been the best the few times when i’ve loaded 5000 pounds of crushed rock in the bed. Braking was the only casualty.
2020 Ford F-350 XLT FX4 4WD SRW SB SC 7.3L Godzilla Gas TorqShift 10R140 397 amps dual Alt dual batts Frnt Dana 60; Rr Dana M275 E-locker 4.30's 4580/4320/4066# payload 7243# curb wt. 11,300# GVWR 5-er prepped. 2020 Northstar Laredo SC, 12v compressor fridge, cassette, 320w Solar sub zero insulation.