Just finished installing a wet bolt kit on our 2012 5er. Since Lippert replaced our equalizers under warranty, we stayed with the Trailair equalizers and added the wet bolt kit. Thanks to all the members who posted pictures - very helpful!
Hardest part was getting the trailer up on jack stands.
FWIW - after only 5000 miles of use, 3 of the 8 nylon bushings were worn out/split and the rest were about 50% gone.
The lady at lippert wanted to sell us "never fail" polymer bushings. Went with the bronze bushings and wet bolts