Yeah I think it's a combination of road riding, salty water spray when transporting on my open trailer, and just age (this thing is almost 30 years old after all). Especially during transport I think, since for the past few years we were having to trailer 2-3 hours away to find any amount of snow.
Every single bolt that held together the trailing arms and skid fought me coming out. Many simply would not come out and I had to bust out the angle grinder and sawzall. That donor sled came apart much easier and has been very handy for bolts, bushings and little things that would have been hard to find otherwise. Someone bought the 500 engine for his go-kart. That's gonna be one quick go-kart lol