Description
Model S175 is our most affordable trailer coupler lock because it slides right over the coupler flange. From an "A-frame" welded-on trailer coupler, to a straight bolt-on style trailer coupler, Model S175 fits them both and will provide a great level of security!
Designing the best coupler locks is not an easy task. We pride
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54 ratings
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Solid
Another good visual message that the trailer is locked from a distance
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Brian · 4 days ago
Stout lock
The lock design is nice and solid. My particular trailer snout was about 1/4” wider than the throat of the trailer lock, so I had to do some grinding to get it to fit. After that it was as the description stated.
M
matthew · August 17, 2026
Great Lock, well built
I considered other options but this one fit my needs, it they can get through this one I'd be impressed, it isn't going to be easy.