Stars, I really hate that you have this ongoing (and worsening) problem.
I am sure this is over-simplifying, but can you cut your losses. Sell it and break even? This is supposed to be fun and obviously you are not having fun.
When we were looking for a new camper, I ran away from every Travel Lite we saw 'cause I remembered the problems you had. You have poured your heart into that little thing and you have nothing to show for it other than lots of knowledge of how these things are made.
Good luck! Again, we missed you at the rally.