Sorry to hear that a resolution to your problem has not been reached.
The complete history of Gulf Stream Coach Inc. can be viewed on the Gulf Stream Coach website and the parent company Fairmont Homes.
I know that sometimes any dealing with a goverment agency can be slowwww... as you found out.
I am surprised at the response from Good Sam as they have helped many reach resolutions with problems with their RV's.
Leaks in an RV can sometimes be a real bear to solve and sometimes the obvious is overlooked.
I guess any manufacturer can build a problem coach in any price range, just look at the other manufacturer brand forums and see the many posts of problems, many of them very serious.
Hope you get a complete resolution to your problems soon so that you can get on with enjoying the RV lifestyle.