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Model 2178 is our most popular trailer coupler lock because it fits the most amount of trailer couplers on the market. From an "A-frame" welded-on trailer coupler, to a straight bolt-on style trailer coupler, Model 2178 fits them both and will provide the most secure trailer coupler lock available.
Designing the best coupler locks is not an easy task. We pride ourselves on producing a "glove like" fit coupler lock. Rest assured that Proven Industries trailer lock products will leave you with simply the best coupler lock on the market. In addition, no other trailer coupler locks can secure your safety chains.
Trailer coupler lock model 2178 may not fit all trailer couplers. Please look at trailer coupler lock index pictures below, if you do not see your trailer coupler picture please fill out contact form to ensure you will get the correct trailer coupler lock. This style will allow you to secure most standard S-hook style safety chains in lock. *Please note, product pictures may not represent current model, as products are revised. All locks are now upgraded to 7 pin tubular lock at no additional cost.