20k miles I had them TOTALLY rebuild mine to pull the 13k 5er. Billet everything, totally rebuild the internals. Why at only 20k? DO IT RIGHT ONCE! and NEVER LOOK BACK!
26k now, tows like a dream, Smart Controller works with the ebrake seamlessly, a real pleasure to drive.
This is going to be the full timer RV tow vehicle and did not want ANY problems down the road.
Focusing on stopping the leaks seemed like a reasonable approach. Made sense to me.
Bob Weis