I installed safe-t-plus on my 2007 workhorse 22,000 lb chassis ( 33 ft Holiday Rambler ). I did have a clearance problem with the original bracket they sent with the kit. The bracket did not have enough offset to clear spring. A call to them got me a new one to correct the problem. They said there were differences in the construction on these chassis even on the same models. Each side of the coach spring shackles have different number of shims in them. All works fine and I am satisfied with the performance in that it does help with tracking and less work driving.