^looks effective but expensive and a bit overkill. check out a handful of doohickeys they have for anti-rattle devices under $25.This is what I am looking at right here:
Definitely overkill as far as capacity but I look at it as a safety margin. It is a cushioned ball mount and the hole is 1 1/4 so you can mount a heavier duty but still a regular "standard" 2 inch ball on it as well.
unless I get lazy, this is what i'll leave on for frequent summer towing for boats or campers, includes a lock.