You might want to take a look at Trimax locks They make some really good stuff! I just ordered a new SS locking hitch pin lock from them to replace my old, rusting bent end pin lock. It is a 5/8" pin that does not use a sleeve. The old one has worked well for quite a few years but has wallowed out the receiver hole on one side and is starting to rust and become worn. Time for a new pin and probably a new receiver as well.
Barney
2004 Sunnybrook 30FKS TT
Hensley "Arrow" 1400# hitch
2002 Ford F250 Super Duty, 7.3L PSD
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I think I am going to forget about a coupler lock and use the Fulton wheel lock. Quick to put on, nice orange color, and fits like a glove. Also, don't have to worry about someone hauling it away on the chains. West Marine $49.
I have the coupler latch lock in the etrailer.com picture, a 5/8" version of the hitch lock in the picture, and another master lock model kinda similar to the coupler nose lock pictured. They all work fine for me with a squirt of light oil or wd40 in the mechanism ever few months.
The hitch lock I like best is the DrawTite j-pin model that has a threaded nut on one side that tightens up the slop in the hitch. I use that one most. My reciever wasn't j-pin compatible so I drilled a hole in the side of it and now it is.