Our Cougar came with the Trailair Equaflex equalizers but had the standard, nylon bushings and dry bolts. After reading some posts rgarding premature bushing failures, I checked our suspension. While difficult to see while assembled, it looked like the bushings had significant wear after only 3500 miles! I added a 'wet bolt' kit which comes with bronze bushings, heavier links and greasable (wet) bolts. If you can spin wrenches, you can do it yourself. There are several threads with good, step-by-step photos. Good luck