For the Toe alignment, you don't need the suspension loaded, so I'm just supporting the truck on the frame rails. I made the Camber adjustment with the wheels on the ground. The alignment cams are easy to move if they aren't rusted in place, even with the weight of the truck on the wheels. That's how it's done in the shop, but they have the advantage of movable wheel pads. You can also buy those if you want to get real fancy. Without those the only thing you need to do is cycle the suspension to check your adjustments. So, either jack it up to lift the wheels off the ground, and then drop it back down, or move the steering wheel back and forth whilst also moving the truck.

Hope this helps.

Cheers