We had our 2016 29.5BHDS upgraded with heavy duty shackle & wet bolt kit by the same shop that added a sub-frame. The shop used the Dexter heavy duty axle kit, which included new (wet) bolts, copper bushings and hangers. They also added an extra brace to each of the axles, which made them extra beefy. We just came back from a 5,000-mile road trip and the trailer towed very well with no axle/tire issue.
Attached are some pics of the work.
Hope this helps.
Originally Posted by snickers104
So has anybody done these themselves?? How difficult was it?