aloha has anybody bought these sulastic shackles for your leafsprings just wanted some feed back my truck is so stiff you need a kidney belt 2001 f250 sl leaf front and rear. i just called the company and they have kits for both front and rear kinda pricey 350 each kit so 700.00 total but if it works i need it.or the trucks gotta go, i almost went off the road the other day hitting some bumps and ended up in the oncoming lane right after passing an oncoming car, not cool. if you have any other ideas that might be cheaper let me know but its gotta be a vast improvement over whats up now. thanks for any feedback