My older F250 ('03)with camper and plow packages doesn't squat like described above. In fact, I like to keep about 300 lbs in the bed because it rides nicer. That's easy to do since it's also my work truck so I have a set of sliding drawers in the bed with tools and such.
Hauling a utility trailer doesn't squat the truck and I don't notice any front end difference. Hauling a 5000 lb RV does squat the truck and I can feel the front end and steering effected. An equal-i-zer WDH brings the weight back on the front axle and maintains usual steering capability. Without the WDH, it's driveable and not a white knuckle affair but I like the steering to be all it can be, especially in Winter driving conditions.