My Ram 5500 is about 11,000 lbs with steel enclosed boxes and flat bed, I suggest going up to a F550 or 5500 if you go to the chassis cab.
I have the short range Torklift FastGuns running from my camper tie downs to the stake pockets of my flat bed. They are quick release so I still have access to the enclosed boxes that I have tucked under the wings of the camper. I use a horse stall mat between the flatbed and camper to keep it from moving and have it properly blocked up front so it does not shift forward more than I want.
