While there are many pros for having them, one of the few cons must be surrounding actually fitting them, made worse when the little plastic cover protecting the metal housing goes missing exposing the female fitting to the elements and creating the obvious metal-on-metal issues.
That said, all can be easily remedied with a fairly hefty dose of WD-40 Specialist® Spray Grease. While regular grease can do the trick in providing the right lubrication needed to ensure a slick entry, the problem is that trying to get a good, even coating several inches inside a cast metal housing hidden behind a rear bumper is near on impossible without smearing the entire area or watching large globules of grease drop onto a drive.
Spray Grease is just that. High-performance long-lasting grease in a can that can be precisely delivered without smear or wastage. Its high viscous formula ensures it doesn’t drip. Simply aim the nozzle in the direction and hit the trigger. A careful amount sprayed on the ‘male’ part of the towbar and the two are easily paired and protected against future corrosion and issues. While the can is in hand, it is always worth coating the ball hutch liberally too…