I have an aluminum flatbed on my 2005 Chevy dually. It has tool boxes mounted above and below the bed. I use it as a work truck for my electrical contracting business. My 11' Fleetwood 11X TC would fit on the bed between the upper tool boxes. I had D rings installed in the floor of the bed that the Happi Jack turnbuckles were attached too. I could put the camper on in about 20 minutes or so. Taking it off took slightly longer because then I had to level it again.
With my family of 5 in the truck, all my tools, camper, and boat hitched to the back I was about 13,100 on the truck axles, about 8,800 on the rear axle. It rode and handled well. I took it from VA to CO, MI, and NY with no problems.
I think there's a picture of my rig on here somewhere. Maybe in my profile page or something.