Sell it for what you can get out of it is the only think I can think of and that may mean giving it away it the house is beyond affordable repair. Even a good MH that old is not worth a lot of cash.
This is one reason we got the TST TPMS that would give us a heads up if we have a dragging brake or low tire pressure.
After all these years the $3000 repair bill is not going to be recovered I expect.
Sorry you paid for a MH that caused to much fear for your kids. I think this is one of more sad causes I have heard. MH's need to be used and inspected if parked out in the elements for sure.
Keep us posted on how selling it goes.