Oh, I'll have to really disagree with you on that - when me and Cat_Rebel built my rear spring packs we left the rear shocks off cause they weren't long enough to reach the axle, the drive home along US 24 was not the most pleasant experience - truck would catch air, bounce way too much, and try to get squirrely. Next day I installed a pair of Gabiel shocks for a 4x4 F350 (they ate longer than the 2wd models) and at ride height they are right at mid-travel, made for an immense improvement in ride quality and overall stability of the truck.
I guess truck weight might have something to do with it, Towcat has a number of bigger trucks setup for work, and I have a dually with a HEAVY bed these big suckers just don't make as much difference, I would imagine the lighter the truck, the more it would hop. My truck is touching the factory overloads before I even put anything on it, My bed is made out of 3/16" plate