The Center Line TS provides Sway Control, superior performance and value. Lift brackets, head and spring bars all work together to deliver a very smooth and highly responsive ride ? a ride that is noticeably quieter than other products on the market. Trunnion style spring bars are matched to popular weight ranges, delivering unmatched integrated weight distribution and sway control, superior performance, more ground clearance, and an unmatched value. Shank NOT Included.