I travel all over the continent, from the Canadian Maritimes to the Mexican border and use two different types of lock to secure my gear.
I'm usually gone for months at a time--this last trip was eight months--so end up leaving my rig in every kind of place imaginable when I go hiking, biking, canoeing or am in the city. From trail heads to deserted campsites to urban parking lots and truck stops I haven't had a single problem with theft, yet. Well, actually, I have, but only when parked in my in-law's driveway the day after I got married. That was almost forty years ago and is a whole 'nuther story.
The best theft prevention is to not tempt thieves. Keep a low profile and not only look like you have your act together, but
have your act together. Having 'overland bling' hanging all over your rig full time is unnecessary, is an invitation, and an extra full-time worry. I hang shit on my van and trailer for the day, only when I know I might need quick access, like recovery tracks, shovel, etc or am actively using it around camp, like solar panel, day packs, life vest, canoe paddles, camp lighting, etc. but it is otherwise inside or out of view.
To lock up my bike and canoe, whether away from camp or when traveling, I like
Bolt Cable Locks the best. Bolt Locks use your ignition key, so you're not always carrying a mess of lock keys or fumbling to find the right one. One key for as many Bolt Locks as you want, whether cable or pin locks. When buying, be sure to pick the one that fits your type of vehicle. They have them for GMC, Ford, Dodge & Jeep, Toyota, Nissan, etc. They make traveling with gear a lot easier.
All Bolt Locks have a stainless steel lock shutter, a plate tumbler sidebar to prevent picking and bumping, and have a double ball bearing locking mechanism. The locks have a durable hinged cover for the keyway, too. That these locks spin on the pin they lock too makes them
much harder to twist or break off. Sometimes that's all it takes, that extra time to try and break off a lock, to thwart would be thieves. They want to grab and go.
The ones I use for bike and canoe are fairly stout
Bolt Locks w/ 6' vinyl-coated coiled cable. The ones I use for my hitch receiver and Max Coupler on my trailer are
Bolt Locks w/ 5/8" Stainless Steel pins. I put the lock back in the coupler on the trailer end after unhooking. Makes it just another step to try and take my trailer.
I also really like the little
Curt coupler locks and use them to lock my trailer's tailgate or to couple small chain together. I keep a couple around. Makes it hard to get a tool in there to cut the bolt.
Master makes one too, of a slightly different, solid brass style. I have both, but prefer the black Curt lock as less noticeable.
It also helps to look like a professional traveler.
I keep official looking round magnets on my doors (actually Trail Guardian magnets) and have a three working antennas on the roof. I never let the appearance of my van and trailer, or myself, scream "I'm on vacation!" I get questions all the time like "You work for the state?" and "So, you're with the University?" I think anyone who might steal your shit thinks twice if they think you might be official anything.
I've also left nicely hand-printed signs attached to barriers when I know I'm going to be away from camp for the day that say "Road Research - GPH4 Permit Holders Only. You ARE being recorded. Thank you." I may actually have some Road Research magnets made for the doors.
edit: Ohh! I meant to add this lock, that I use primarily on my bike when I park it out front of places in the city, because it is FAR harder to cut with long-handled bolt cutters than a cable lock or cordless grinder. It's called a
TiGr Mini+ Titanium Bike Lock and it rocks. It's the best bike lock ever and has a spinner lock end too, making it more difficult to just break off the locking end. Again, having something look rugged and professional and much harder to deal with helps prevent theft.
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