I am working on a project related to the Explorer; the tow bar. I am sick and tired of it rattling around in the RV hitch. Its causing wear on the hitch pin holes and getting worse. I have tried a set screw on the top of the hitch mount, and it broke in half on the last trip. I replaced it with a new, much stronger bolt on the bottom of the hitch, but it is not a complete, worry-free fix. I have a solution, and when its finished, it should work for nearly every hitch out there if anyone wants to copy it. I came up with it while finishing up my version of a "J" hook hitch pin (I will post pictures later). However, I am having trouble finding one piece of hardware; I am trying to find a 5/8"-11 bolt, fully threaded, at least 4" long, and either grade 5 or 8. I have had no luck locally. I am going to call Ababa and Fastenal in the morning. I located a 36" section of hardened threaded rod that would work with a nut welded to the end to make it a bolt, but the piece was over $25. All of the other threaded rod I found is not graded and as such, not to be trusted with my favorite vehicle. Anyone have a section of hardened 5/8"-11 rod that they don't need? Anybody have a fully threaded bolt? Anyone have a suggestion on where I can find one?