Long distance dolly towing

Although my car is an earlier model, years back I knew that one day I would need to tow it, so I cut 2 rectangle holes 1/2" wide by 3" high out of the bumper and ran 2 flat 1/2" wide teel pieces through the bumper onto the frame, yet I welded it to the bumper as well.. I carry a tow bar I carry in the trunk.. It works better than good and has for almost 30 years..