I think what's best about these threads is that one can look for patterns. That's what I was looking for when looking for a used unit. It's harder with new units, because that particular year model has not already been in service long enough to establish a pattern. Nor does one see many comments and complaints.
My findings were that most people were happy with Winnebago. But on the 99 Ford V10 watch for spark plugs stripping out, they can be re-threaded but Ford will try to sell you a new head at over $2K.
So with those findings, I spent extra time listening to it run with the inside cover off, as well as my head under the hood listening, and shooting it with a IR temp gun. What I found helped me to select a unit.
On helping yourself, Frizlefrak and DearMissMermaid are spot on. If you don't know how to put it on Youtube, a 15 year old kid can probably film it, post it, and get it a lot of hits. One other thought, if you live in a large city, you might check with your local news consumer reporter. I wrote a letter to Marvin Zindler (our "Action News Reporter") when I was living in Houston, he got the problem solved quickly, and I never had to go on the air. All's well that ends well!