Well your camper shell does not weigh 2,000 lb , correct ? its probably quite lighter.
Just got off the phone with my niece's husband who is a structural engineer. We discussed the weight numbers and here is what he came up with.
The truck without the camper is actually quite balanced weight wise with only the trailer on it ( roughly 4,600 lb on each axle) thereby really not needing weight distribution.The same thing is true (balanced ) with just the camper. When combined ( camper along with the trailer ) it actually adds 1,247 lb more to the rear axle and subtracts 347 lb off the front axle (fulcrum effect). In order to balance the trucks axles weight equally,then what is required is to shift approx 800lbs up to the front axle (tires) through a weight distribution system.
I think thats correct.