My truck rode very much like a truck with the bed empty in its stock form. Adding SuperSprings did not change the ride with the bed empty at all as they do not engage until the factory springs are overloaded by the weight in the bed.
Adding an anti-sway bar at the rear did nothing for the ride or handling with the camper in the bed but made a quite noticeable improvement in the ride and handling of the truck when the camper was off the truck. Pickups, as all owners can attest, are very light at the rear axle and this results in wheel hop in circumstances that would not affect a van or sedan.
The anti-sway bar transmits road shock from one side of a car or truck to the opposite wheel and with my truck this resulted in far less hop when hitting a depression, bump, or bridge expansion joint, etc. with the bed empty. I thought I would get some benefit in handling with the camper in the bed and I was in error but I was very happy to get the better ride and handling with the bed empty and so my $300 investment paid off.