Glad I found this thread! My 99 4Runner has rust-cancer on the rear portion of the frame rails. The left side area where the hitch mounts to the frame is very bad, as well as where the left frame mounts to the rear body mount. The right side isn't quite as bad, but it's not far behind. The rust on the left side is bad enough now that the body has separated from the frame/cab mount. Shaking the hitch causes a "clunk" where the rusted remanence of the cab mount hits the body. There is absolutely no way I'd tow anything without fixing this first, and I know I'll be towing about a 2000lb load in a couple months (i.e. I need to get on the fix right away).

I'm thinking of buying the ART-221-S and ART-222-S to repair the frame sections and body mounts on both the left and right sides. From what I can tell, this looks like it would produce an acceptable fix. I don't seem to have much noticeable frame rust forward of the spare tire cross member, but the inner section of the left frame from the spare tire cross member to the frame rear end is almost totally gone from rust.

Just thinking out loud and sharing. Anyone else fighting rust in this same area and successfully repair theirs? Does this seem like a good plan? I've done a little welding in the past, but a good friend of mine (I'm lobbying to help) is a very experienced welder and has good MIG welding equipment.

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