I have two F-150s. My older one, a 1998, just doesn't have the braking power which would make me comfortable with that heavy a load, no matter how well the suspension system was rebuilt. My newer one with bigger rotors has a decent 60-0 stopping distance... but it has a 5.5' bed, which makes it worthless for a truck camper.
My solution is going to be a one ton, perhaps a dually with the Rickson DRW to SRW converion, since with any decent Lance or Arctic Fox rig, one is likely going to be overweight on a SRW once all the toys are packed in and the tanks filled.