I use anti seize, and a high quality 1/2” impact to tighten trailer balls, never had one work loose.

Certainly seen some loose here and there in parking lots, probably they had used a not very long wrench and don’t realize the large torque requirement.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-