WWTD? Have you spoken with Thor customer service? If it's historically a design flaw, they may cover it under warranty. If it's a result of damage you may have to pay. If it's on you, I would look for local mobile rv repair folks or a small independent shop. Dealers have lots of overhead and labor rates are crazy. I know its low to the ground but Thor will say..."it was that way when you bought it...you should have been more careful".
Now an SOB
Traded Thor for Melbourne Prestige 24NP
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie
Blondie passed in 2020 at 5 to Leukemia