I can only speak for myself, but yes. I pull our boat on a regular basis and the hitch will rattle like crazy without a tightener. Receivers aren't made to very close tolerances since they have to deal with a lot of dirt and crud. Having a tightener takes the slop out of the hitch and makes for a better towing experience.
Dave & Myra
One day your life will flash before your eyes,
make sure it's worth watching!