A lot of times, they made the frames on those things with the "worst of the worst" steel. I've welded the toungues back on them before so they could be moved but didn't feel great about it. It needs to be fishplated and angle needs to be put in wherever it can go, for sure. If I were to do it, it would possibly cost a grand. Depends if a part of the frame needs replaced or not. You may get lucky and fix it with a couple benjamins, who knows?