Yeah, I don't think that truck could drive worse than you described with no shocks!
I haul about 10 percent less camper on about 50 percent less truck and a short bed. Back n forth to AK pulling a trailer over the frost heaves with some 100,000mileold bilsteins and air bags pumped up too high and never felt like your description.
Either they forgot to charge the shocks or maybe you just expected a more profound effect?
In my limited camper experience, OE size truck shocks that are not much bigger than my snowmachine shocks (4 shocks, 500lb machine) and smaller than some 2 seater off road buggies are not going to tame the momentum created by a 2 ton high CG load that well.
If you want planted, some big diameter external reservoir shocks or dual shocks at each corner with very heavy and slow compression and rebound damping are the only thing that's going to make a huge difference.