FWIW, When I removed the stable lift from my 1181 a few years back I found a ton of mess. The rear of the slide out room was hanging at least 3 inches lower than the front. This was from the massive 500 pounds that was installed on the wings. I tried to jack it up with a floor jack and straiten it out but it didn't work. The aluminum was bent in that area. I got some help from a local RV guy that does work on the side and we fixed it the best we could by reinforcing the sag with painted steal. It lifted it about 2 inches and I'm still left with an inch of sag that I have lived with for some time. Obviously yours is much worse. Mine was worth fixing to me so I fixed it. If yours is worth it to you and it seems it is then go ahead and tackle it. I have no regrets and you won't either.
This is what the underside looked like and here's what it looks like now.
here it is with the lift on. can you see the crack in the frame above the flip up door? There's also one in the front I don't think you can see. It was literally hanging there by the structure of the camper not the frame.
My point is this, in my opinion it's worth saving and it's going to be a ton of work. I don't regret any part of the decision I made to fix mine. Take it for what it's worth just some friendly advice. Good luck sir!
