All of this seems related to the level of knowledge of the buyer, the economics involved, and the circumstances of the RV when purchased.
The OP has little knowledge of how mechanical systems work and was at least prudent enough to choose the addition of a second pair of eyes when purchasing. However, that does not mean that the choice of eyes was correct or enough to find all the defects. This insufficient level of understanding is illustrated by the AC fan issue and the misconception of weight loading causing the brake failure.
The OP chose not to have a thorough mechanical inspection done, instead relying on the seller to disclose any known defects or inspecting for any unknown problems. This was mainly a matter of economics since an RV technician would have seen and reported most of the glaring issues like delamination and failed brake hoses/calipers.
I'm pretty much astonished that a buyer of a motor vehicle would assume that there are no issues with a 10 yr. old vehicle. Nowhere in the OP's narrative are mentions of typical mechanical systems, wear to the vehicle, or the absence/completion of service records. To blame a mfg. and assume assistance for ongoing problems 10 years after the RV was built, is just ridiculous.
IMO, the OP should seek assistance from a service technician to uncover any/all issues with the RV and quit blaming the dealer or mfg. for his problems. There is just a huge lack of knowledge depicted here.