Originally Posted by Platokidd
I spray paint my L brackets and bars at the contact point with a product call mower guard. Hitch works great for me!
FYI - Mower Guard is just a new marketing for old-fashioned dry film aerosol graphite. So if you don't have a Napa, just about any industrial/metal supplier will sell this in "vanilla" labeling for about $6/can and you can order from McMaster-Carr, Amazon, and elsewhere.
I'm in the other camp and want metal-to-metal contact for the friction, but I coat the polished metal surfaces with Boeshield T9 to inhibit surface rusting between uses.