I certainly agree with your comment regarding "new" RVs.
This is our fifth RV (first motorhome), and although I've basically had to rebuild all of them, this one is by far the worst ever! Although it only had 5000 miles on it when we purchased it, the unit is virtually self destructing - especially on the interior. Ok, I got that off my chest!
The good news is that the 350 chassis and the big V8 are Wonderful - so glad that we insisted on a 2021 or newer to get the bigger V8! And now over 2000 miles into our maiden voyage, we've averaged 9.6 mpg towing our 2005 Ford Ranger!
Cheers!