We are currently having this issue with our 2013 Dutchmen denali 311bh...
I just picked the trailer up from the repair shop after having all new brakes installed to the tune of $850.00 ish !!! Due to the seals leaking grease into the drums and impregnating the friction surfaces.
I will be adding to the complaints as soon as I grab my VIN number from the trailer.
We are less than 2 months out of warranty but are in contact with Keystone (now running Dutchmen) about getting some or all of this covered.
Please fix your links in the original message so we can find the documents you have found. I think they may be helpful for my case.
Thanks