Used to have a Maverick model 8801. I think the weight was comparable to an 855.
My F250 came from the factory with the plow prep package. It had a 1 - 1.5 inch squat, without putting anything in the bed. I replaced the spring blocks with a set for an F350 (they are two inches taller the F250 blocks) and I installed Timbrens. With the camper, the truck sat level. Without the camper, the rear end sat higher by a little over an inch. I also, added Big Wig sway bar.
Note: When you load the camper, you'll want to increase pressure in your tires, and if you stop somewhere for an oil change, the grease monkeys are trained to let air out to get it back down to what the door sticker says.
18 Nissan Titan XD
12 Flagstaff 831FKBSS
Wife and I
Retired Navy Master Chief (retired since 1995)