TSB-02-001-01 States that there is a lower block kit for rear of are trucks. it lowers the height 1. 7/8. but it can not be used with camper special package which my truck has. i pull two differant gooseneck trailers thats way i order the package. WHAT IN THE WORLD DOES OVERLOAD SPRINGS HAVE TO DO WITH SPACER BLOCKS AND SHOCKS. THANKS