I use a clamp-on bike rack that clamps around the draw bar on the ball hitch. Especially when not towing anything and just using the bike rack, it will rattle around, swinging side to side. Adding some Herculiner bed liner to the draw bar helps to fill the gap between the draw bar and the receiver hole, stabilizing and quieting the set up. I masked off the right side and brushed on the Herculiner.