I needed to find a way to lock up a small utility/kayak trailer and found an old bike lock in my garage. Turns out that it easily fits around the leaf spring and through the wheel.
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I just use a piece of chain and go through the wheel and tie it back up on the frame in plain view secured with a simple lock. Even more than for security, when I am parked on a hill, this would stop the wheels from rolling and my td from rolling into or over any of my neighbors.
I've used chains/cables with separate locks (usually around a tree, attached to the trailer), coupler-specific locks of several types (I have a welded-steel cube surrounding the Bulldog coupler on my car-hauler; wish I could find a similar one for the Attwood coupler on my TTT), and a few bicycle-lock-types for other things (long shank locks, usually with small diameter legs). I even had a Kryptonite bicycle lock or two, years ago, when I could still ride bike trails. But, my favorite type is probably the cable lock, with its' own lock attached (not a combination lock...they fail quickly, IMO).
Regular locks, of most types, are not a challenge to even the most inexperienced thief, and can be broken open with just a pry-bar and/or a BFH. Most coupler locks can be defeated in less than a minute, often quietly, so I don't trust or rely on them entirely. I do trust the welded coupler lock on my car-hauler, but until I found it, I ran a Brinks cable lock thru a rear wheel and around a spring, if I had to detach my truck from it, which seldom happened. On the same note, I seldom detach my truck from my squareback TTT, because the Weight Distributing hitch set-up I adapted to haul it, is very hard to attach/detach (two jacks are needed), so no further locking is necessary. On two or so trips I had, before the WD hitch adaption, I did use a cable lock thru a wheel (modular type, with holes).
I currently have three cable locks: two 20+ years-old Brinks (one currently in use, and the other gone missing during our recent home changeover), and a smaller 5+ year-old Masterlock, on my wife's travel trailer spare tire (new, on a new wheel, tempting theft). As the numbers state, I've used them for many things, over many years. I think they are less likely to be broken by hammer or pry-bar, but require a large bolt-cutter, angle grinder, or metal-cutting saw to defeat. And I don't think most people are as likely to try, unlike just giving a simple lock a quick hit or leveraging blow. Again, IMO.
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After reading this thread for the third time, I decided to start using a cable lock again on my campouts, even if if never leave the campsite, just because. I just now ordered a brand of lock new to me, Onguard, though I've hear of them before, and never used one of their products. I failed to measure the hole diameter of my wheels first, so it may not fit, in which case I'll re-use the Masterlock cable lock, that I have on the wife's trailer spare tire.
onguard akita cable lock, new.jpg (175.75 KiB) Viewed 653 times