noisy hitch

As odd as it seems occaisonally my RBW hitch would begin chunking if it was dry. Once I greased the plate and pin bar the chunking would go away. It seemed wrong to use a lubricant to fix a movement issue but I was told the hydro static friction properties of the grease actually acts as a shock asorber to lessen or stop the chunking movement.

You might want to tell your friend to grease the plate on his hitch like the truckers do. I use a teflon grease product, it's a dry lube.