I wouldn't get too obsessive about finding "the best" coupler lock, and paying a ton for it. Three reasons:
1. The real purpose of a hitch lock is to make a potential thief move on to the next trailer, rather than openly using bolt cutters, chisels, or a hacksaw to get yours.
2. It has been reported on this forum that if a thief is determined to get a particular trailer, and organized enough to do it, he'll ignore the coupler and lock altogether. His tow vehicle will have a quick hookup device equipped with short chains to hook up to your trailer's A-frame, and tow it, coupler lock still in the coupler, to a location where he can work on it in peace - or load it onto a flatbed.
3. I'm under the impression that an opportunistic thief is unlikely to steal a Trail Manor, as opposed to a run-of-the-mill upright trailer. A TM, being found in such small quantities, and having such a unique appearance, is simply too obvious, too easy for police to spot once stolen, and too hard to sell. The thief wants something bland and common.
So by all means get a hitch lock. But don't spend so much that it would guard Fort Knox.
Incidentally, this is a situation where a swing tongue can help a lot. Once the pin is pulled and hidden, and the hitch swung to the side, a thief is going to have a hard time stealing it, even if he has the chain device.
Bill
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