This happens where I live (in quebec). While this is saddening, you often see tons of salt on the road from november to april where this happens, so a lot of older vehicles suffers from severe rust or rust-related problems.
Working and roadworthy 4runners go for a pretty high price here in quebec compared to other SUV of the same years, and they sell pretty fast. My guess is that this particular vehicle was not road worthy anymore due to rust or being in storage for more than 12 months, which call for a special inspection.