New to this and all forums. I have a '05 Silverado SB 4X4 2500 HD Duramax with the Allison tranny. Love the truck. The wife and I tow a 2012 37ft Crossroads Rushmore 5th wheel. Just completed a 10,000 mile 21/2 month mid west trip. Broke my passenger mirror when I backed into my small new garage. The swivel broke off off the backing plate. Repaired that with epoxy only to have one of the adjuster posts brake off on instalation. Hopefully the dealer has them in stock.