@ Amphibious54 - I have a big pick-up truck as well and I decided to only put a rear sway bar on it. I don't use it that often for hauling or carrying heavy loads so I wanted a more significant reduction in understeer. My truck already has a front sway bar and the upgrade is only an increase in diameter. This would increase understeer without significant load in the rear and a compensating bar in the back.
Under load my truck is probably not as stable as yours, but empty it can corner very tight. I do have to be careful though when the road is slick so the rear end doesn't slide out from under me. Before deciding on whether to upgrade front and rear or just rear, it would be wise to take into account what your vehicle is used for, and how much understeer or oversteer you prefer.