I have noticed that when I go wheeling, one of my back tires seems to regularly come off the ground without flexing all that much. I figured something had to be wrong. After looking under my truck for a few minutes, I noticed the bracket holding on the leaf springs was almost touching my tow package. I guess when the package was installed, flex was not taken into consideration. Anyways, after just a few inches of flex, the back of the springs were hitting my tow package, not allowing the springs to compress anymore. For the cost of one sawzall blade, I remedied this and doubled my rear articulation. I figured if anyone else out there might be having this problem without knowing it, and could fix it as easily as I did, this info was worth posting.
Here are a few pics. One with the piece I cut out in place, one after shot, and one of the piece from the back where time and a lot of friction had chewed away at the steel.