My comment: I have the same problem..... almost constant correction. Mine is an 08 Monaco Dynasty and the problem has been there since it was new. For a long time I thought it was me. I have had the alignment checked at three different shops..... all rv shops. I also have had it weighted (all 4 corners).
I got on this blog with my problem. Several posters told me of a dealership in Florida (I'm thinking Lazy Days but that was a couple of years ago and I'm not sure). They spoke very highly of them and said they (the Florida dealer) fixed the problem (and other problems) when no one else could.
I called the Florida dealer's front end foreman and he gave me the exact specs for the alignment. The last place that I had align my coach said they used those exact specs but it didn't help any. Last year (after 7 years) I put brand new Michelins all the way around and that helped a good bit.
I have pretty much resigned to the fact that it is just that way.
When we are at the different rallies, I pose the problem to other rvers, but no one has a A-B-C fix.
If and when I get close to Florida, I am going to stop by that dealership (if I can remember their name.)
If and when you get the problem squared away, please post the answer.
I will and I'm sure others would appreciate it. Good Luck!