R1T's towing capacity is just over the typical 10k limit for Class IV, which is why it is listed as Class V, but uses a 2" receiver. If you have a 2" ball mount that is what you need. Most ball mounts will have a little space and can rattle around. Some ball mounts have detents or other mechanisms built in to help eliminate the sound, or you can get an anti-rattle pad, clamp, or pin to help tighten things down and eliminate the movement and noise. There are lots of options available. Check out e-trailer and see what would work best for your particular application (hollow vs solid ball mounts will use different options).