🔒 Boat Trailer Coupler & Latch Lock Kit – Parked or Hitched, One Key Opens Both
🔒 Boat Trailer Coupler & Latch Lock Kit – Parked or Hitched, One Key Opens Both
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🔒 Boat Trailer Coupler & Latch Lock Kit – Parked or Hitched, One Key Opens Both
Two-lock kit for boat trailers, campers and more
Lock the Trailer.
Keep the Boat.
Most stolen boats never touch the water on the way out. They leave on their own trailer, hitched to someone else’s truck. This kit locks the coupler when you’re parked and the latch when you’re hitched.
One key opens both. The powder-coated finish is made to live outdoors. And it comes in two sizes to match your coupler.
Not sure which size you need? Check the fit guide
Where boats actually get stolen
Thieves Don’t Need Keys.
Just Your Hitch.
An unlocked trailer is the easiest thing in the driveway to steal. Back a truck up, crank the jack, drop the coupler on a ball and go. No broken glass, no alarm, just a few quiet minutes in the middle of the night.
73%
of stolen boats were taken while sitting on their trailers
~15%
of those owners had any kind of lock installed
1 in 10
stolen boats is ever fully recovered
Source: BoatUS study of five years of its marine insurance theft claims.
Put simply: most stolen boats had nothing on the hitch. This kit closes that gap.
It’s also why the National Insurance Crime Bureau’s “Dock It and Lock It” advice for boat owners includes a trailer hitch lock.
How the kit works
One Blocks the Ball.
One Pins the Latch.
A trailer gets taken one of two ways: hooked to a thief’s ball while it’s parked, or unhooked from your truck while you’re away from it. Each lock in this kit shuts one of those doors.
🔒 The coupler lock
Fits up under the coupler and fills the ball socket, with its bracket wrapped around the front lip. Locked on, it leaves no room for a tow ball, so the trailer can’t be hitched.
🔐 The latch lock
Passes through the coupler latch and holds it shut. Use it alone when you’re hitched, or together with the coupler lock when you’re parked for the night.
🔑 Keyed alike
One key opens both locks, and two matching keys come in the box. Keep one on your truck keyring and one at home, never on the boat.
👀 Visible on purpose
A heavy black lock on the hitch is the first thing a flashlight finds. That alone is often enough to send a thief looking for an easier trailer.
At the ramp and on the road
Out on the Water?
Your Trailer’s Still Locked.
Once the boat’s launched, your truck and empty trailer sit in the ramp lot for hours. A coupler lock can’t help there, because the trailer is still hitched. The latch lock can: it keeps the latch closed on your ball, so nobody can unhook your trailer and tow it off with theirs.
🚤 Ramp lots
Lock the latch after you launch, then fish all day without glancing back at the parking lot.
🏨 Fishing trips and tournaments
Staying hitched in a motel lot? Lock the latch. Dropping the trailer for the night? Fit both locks before you check in.
⛽ Fuel and food stops
Quick stops are when rigs get messed with. A few seconds with the latch lock costs you nothing.
Hitched or parked, one key covers both.
Built to live outside
Made for Months
in the Weather.
Your lock spends more time outdoors than your boat spends on the water. Both pieces have a heavy-duty powder-coated finish that helps resist rust and corrosion through rain, humidity, road salt and winter storage.
💡 Keep it turning smoothly: Before winter storage and after saltwater trips, rinse both locks with fresh water, let them dry, then puff a little graphite lubricant into each keyhole.
🛡️ Storing for the season? Add a wheel lock and park with the hitch facing away from the street. Every extra lock a thief can see makes your trailer a slower, louder job.
One kit, every trailer
Not Just for
Boat Trailers.
If your trailer has a 2″ or 2-5/16″ ball coupler that fits the measurements in the fit guide below, this kit is made for it.
🚤
Boat trailers
Between trips and all off-season
🏕️
Campers and travel trailers
Driveways, storage lots, campsites
🌿
Utility and landscape
At home and on the job site
🏍️
Toy haulers
The cargo is worth more than the trailer
No tools needed
Locked Up Before
You Walk Away.
When the trailer is parked
Unhitch the trailer
Raise the coupler off the ball with your tongue jack and open the latch.
Fit the coupler lock
Slide it up under the coupler so it fills the ball socket and its bracket wraps the front lip. Snug it up and turn the key to lock it.
Lock the latch
Close the latch, push the latch lock through it and lock it with the same key.
🚚 When it’s hitched: Seat the coupler fully on the ball and close the latch, then push the latch lock through and lock it. The coupler lock rides in your truck until you park.
Keep the spare key on your truck keyring, not on the boat. Nobody wants to find that out at the ramp.
Why a two-lock kit
One Lock Covers
Half the Problem.
A coupler lock only works while the trailer is unhitched. The moment you hook up and walk away, at the ramp, the motel or the gas station, it’s sitting in your truck bed doing nothing.
| This kit | Coupler lock only | No lock | |
|---|---|---|---|
| Blocks hookup while parked | ✓ | ✓ | ✗ |
| Stops unhitching from your truck | ✓ | ✗ | ✗ |
| Visible deterrent on the hitch | ✓ | ✓ | ✗ |
💬 Straight talk: No lock can make a trailer theft-proof. What a visible, heavy-duty lock does is make yours slower, louder and more trouble to take than the trailer next to it, and that’s usually what sends a thief down the row.
Will it fit? Check in 30 seconds
Find the Number.
Order That Size.
Look at the top of your coupler. On most couplers the ball size, 2″ or 2-5/16″, is stamped or cast into the metal. Order the kit that matches, then check the three measurements below.
Ignore the 2″ square receiver on your truck. That’s the hitch size, not the ball size, and it’s the most common mix-up.
| 2″ kit | 2-5/16″ kit | |
|---|---|---|
| Ball size on your coupler | 2″ | 2-5/16″ |
| Max coupler lip width | 3-3/4″ | 4-3/8″ |
| Max coupler lip height | 5/16″ | 5/16″ |
| Max lip depth, socket to front edge | 1/2″ | 1/2″ |
The lip is the flat flange around the front of the ball socket. Width is measured across it at the widest point; height is its thickness.
Made to fit
✅ 2″ and 2-5/16″ A-frame ball couplers
✅ Select straight-tongue ball couplers within the measurements above
✅ Boat, travel, utility and toy-hauler trailers
❌ Not for 1-7/8″, adjustable-height, Bulldog-style, rolled-lip or underslung couplers, 50 mm couplers, ring or pintle hitches, gooseneck or fifth-wheel hitches, or oversized couplers such as the Airstream Basecamp’s.
The latch lock fits standard coupler latches. A few campers with extra-wide latches may need a longer latch pin.
📸 Not sure? Send our support team a photo of your coupler from the top and the side, and we’ll tell you which size to order.
🛡️ Still unsure? If it doesn’t fit your coupler, our 30-day guarantee has you covered.
Found your number?
Choose your sizeProduct details
Everything in the Box.
In the box: 1 coupler lock, 1 latch lock, 2 matching keys
Sizes: 2″ or 2-5/16″ ball couplers (choose before adding to cart)
Keying: Keyed alike, one key opens both locks
Finish: Heavy-duty black powder coat
Latch lock span: Up to 7/8″
Weight: About 3.2 lb
Works with: Boat, travel, utility and toy-hauler trailers
Not included: Wheel lock, receiver hitch pin, trailer
Sold as a theft deterrent. No lock can guarantee a trailer won’t be stolen.
Quick answers before you order
Before You Order.
Will it fit my coupler?
Check the ball size stamped on top of your coupler, 2″ or 2-5/16″, and order that kit. Your truck’s 2″ square receiver is a different measurement. The kit fits A-frame and select straight-tongue couplers within the lip measurements in the fit guide, and most travel trailers use a 2-5/16″ coupler. It won’t fit 1-7/8″, adjustable, Bulldog-style, rolled-lip, underslung, 50 mm, ring or pintle couplers. Not sure? Send us a photo from the top and the side and we’ll check it for you.
Can the locks stay on while I tow?
The latch lock can. It holds the latch closed on your ball and stays on while you drive. The coupler lock is only for when the trailer is unhitched, so take it off before you hook up.
Do both locks really open with one key?
Yes. The coupler lock and the latch lock are keyed alike, and two matching keys come in the box. Keep one on your truck keyring and the other somewhere safe at home.
Will this make my trailer theft-proof?
No lock can promise that. This kit is a strong, visible deterrent that makes your trailer slower and noisier to take than the one next to it. For long-term storage, pair it with a wheel lock and park with the hitch facing away from the street.
Will it rust or seize up?
The powder-coated finish helps resist rust and corrosion. To keep the keyways turning smoothly, rinse the locks with fresh water after saltwater trips, let them dry, and add a little graphite lubricant before winter. If a lock ever feels stiff, a little lubricant usually frees it right up.
My boat trailer gets dunked at the ramp. Is that a problem?
The coupler normally stays above the water when you launch, and the coupler lock is off whenever you’re hitched. If salt spray reaches the latch lock, rinse and dry it when you get home.
Before its next night alone
Don’t Be the Easy One
in the Lot.
Pick 2″ or 2-5/16″, lock the coupler when you’re parked and the latch when you’re hitched, and keep both on one key.
It costs less than a tank of gas, and a lot less than a season without your boat.
Choose your sizeCovered by our 30-day guarantee.
