First you need to see how the camper sits on the truck. If it is level front to back and left to right then no need to add to the suspension.
Normally the stock shocks on pickup trucks are not really up to the task of dampening a heavy load like a camper. Replacing them with Bilsteins or Rancho shocks is a good idea.
Some trucks benefit from a rear anti-sway bar and the Fords more than most.
In terms of load capacity the limitation is usually the tires and with DRW this is not going to be the case as there are twice as many tires to carry the load.
