The frame rust issues that Toyota had were only on certain model years of Tacoma's. It had to with anti-rust treatment that was to be applied during manufacturing but wasn't up to spec. I believe Toyota sued Danaher over it and won but I think Toyota spend a whole lot more on recalls. They recalled my Tacoma and redid the frame years ago and it is still running strong. No signs of unusual rust on the frame.
The truck that that is for sale is a 4 cylinder. The 6 cylinders from that era did have issues with head gaskets blowing out. The 94 I had had a factory recall to replace the head gasket. I had it for 14 years and never had any head gasket problems. It was a dog of an engine by modern standards, however.
