Tow Bar

we just bought a 92 jeep that is set up to tow 4 wheel down behind our motorhome. It came with a Kwik Tow bar with a 2 inch ball. After doing some research I believe it hooks to a rock hard 4 x 4 tow hook on the bumper. We already have a ready Brute Tow Bar with ready brake with Blue Ox hooks. I would like to add a ready brake to the jeep and use this tow bar. The web site for rock hard says it fits most blue Ox tow bars. The blue Ox hook fits in between the 4 x 4 hook on the bumper. I would need to get A smaller in diameter and longer locking pin to secure it with. Does anyone have info on using this type of set up?