Ive had all pro leafs since day 1 and ibe never ever ran a bump stop. Mybsorings are still great and not inverted. I installed them in 2012 and ive beat the crap outta my truck. I purchased a truck which had all TG springs and parts. It was the worst teuck ibe ever wheeled. I sold it immediately. The TG springs were stiff as a board. To read others posts here that they had TG and were dtiff took a while to settle and are now inverted seals the deal for me. Oh, on top of how TG was started. That in itself is enough to stay away.