Trailer Latch Locks for Hitched, Parked Trailers
Our top picks
AMPLock
Custom-fit range for many coupler types.
Check current price
Check price at AMPLock ↗Blaylock TL-33 Universal
Fits many trigger, latch and hand-wheel couplers.
Check current price
Check price at Blaylock ↗Master Lock 2866DAT
Fits 1/2 and 5/8 in receivers.
About $19 (masterlock.com list)
Check price at Master Lock ↗
Comparison
| Lock | Best for | Fits | Price (approx.) | |
|---|---|---|---|---|
| AMPLock (coupler, gooseneck, kingpin, hitch, latch pin, door locks) | Dedicated latch pin locks | Coupler (boat, RV, cargo), gooseneck (Bulldog, Atwood), kingpin, hitch 1-1/4 to 3 in, latch pin, barn/roll-up door | Check current price | Check price ↗ |
| Blaylock TL-33 Universal | Bracket lock for latch couplers | Many trigger, latch and hand-wheel couplers, 1-7/8 to 2-5/16 in | Check current price | Check price ↗ |
| Master Lock 2866DAT | Pair with: hitch pin lock | 1/2 in and 5/8 in receivers; 2-3/4 in usable pin length | About $19 (masterlock.com list) | Check price ↗ |
How we chose: picks are based on published specifications, materials, fit charts, manufacturer information and patterns in owner reports. We have not lab-tested these locks. Prices are approximate list prices seen on maker sites in October 2026 and change often.
Our picks in detail
AMPLock (coupler, gooseneck, kingpin, hitch, latch pin, door locks)
Who it is for: Owners who want custom-fit security and a fit-finder.
- Custom-fit range for many coupler types
- 5-year warranty with registration
- Fit quiz on maker site
- Prices not confirmed on our check
- Heavy
- Type: Custom-fit lock range
- Fits: Coupler (boat, RV, cargo), gooseneck (Bulldog, Atwood), kingpin, hitch 1-1/4 to 3 in, latch pin, barn/roll-up door
- Build: Heavy-duty steel, custom-fit; fit quiz on site
- Keyed alike: Check per model
- Price: Check current price
5-year warranty with registration (per maker).
Check price at AMPLock ↗Blaylock TL-33 Universal
Who it is for: Latch-style coupler owners.
- Fits many trigger, latch and hand-wheel couplers
- Simple bracket design
- Padlock not included
- Security depends on your padlock
- Type: Bracket coupler lock (padlock required)
- Fits: Many trigger, latch and hand-wheel couplers, 1-7/8 to 2-5/16 in
- Build: Aluminum bracket, 3/4 in steel pin; padlock not included
- Keyed alike: Depends on your padlock
- Price: Check current price
Master Lock 2866DAT
Who it is for: Most trucks with 1-1/4 or 2 in receivers.
- Fits 1/2 and 5/8 in receivers
- Rated up to Class III/IV, 10,000 lb (5/8 in)
- Weather seal and cap
- Only protects the hitch, not an unhitched trailer
- 2-3/4 in span too short for some receivers
- Type: Receiver hitch pin lock
- Fits: 1/2 in and 5/8 in receivers; 2-3/4 in usable pin length
- Build: Swivel head, push-to-lock, weather seal and cap, 4-pin cylinder
- Keyed alike: K1 key blank
- Price: About $19 (masterlock.com list)
5/8 in pin rated Class III/IV, 10,000 lb; 1/2 in Class I/II, 3,500 lb.
Check price at Master Lock ↗This guide covers one angle
This page covers locking the latch while the trailer is hitched. For the full comparison of every option, see our hub guide: best trailer coupler locks.
When a latch lock makes sense
- Hitched and parked for a short stop (fuel, food, campsite).
- To stop pranksters releasing the latch.
- As one layer with a hitch pin lock.
Choosing one
- Measure the latch hole; most take a 1/4 in shackle or pin.
- Use a weatherproof or marine padlock if the trailer gets wet.
- Keyed-alike with your hitch pin lock if possible.
Limits
A thin shackle cuts easily. Treat latch locks as a convenience, not real theft protection.
Latch lock vs coupler lock vs hitch pin lock
| Lock | Protects against | Typical cost |
|---|---|---|
| Latch lock / padlock | Someone opening the latch and unhitching your trailer from your vehicle | Low |
| Hitch pin lock | Someone removing the ball mount (and trailer) from your receiver | About $19 and up (e.g. Master Lock 2866DAT) |
| Coupler lock | Someone hitching your unhitched trailer to their vehicle | About $36 to $300+ |
For a hitched trailer parked at a store or campsite, the latch lock plus hitch pin lock combination covers both release points. For an unhitched trailer, only a coupler or wheel lock helps.
Fitting tips
- Close the latch fully on the ball before inserting the lock, then tug the coupler upward to confirm it is seated.
- Use a padlock with a short shackle so there is little room for a cutter.
- Choose stainless or brass bodies for boat trailers; plain steel padlocks rust quickly.
- Keep a spare key in the tow vehicle, not on the trailer.
Do not confuse with a safety pin
Many couplers ship with a plain safety pin or clip in the latch hole. Its job is to stop the latch vibrating open while towing. A latch lock does the same job and adds a lock, so check it is rated or suitable for towing use if you leave it in while driving.
Our pick
AMPLock: dedicated latch pin locks. Owners who want custom-fit security and a fit-finder. If budget matters more, see the other picks above.
Check price at AMPLock ↗FAQs
- What size padlock fits a trailer latch?
- Most coupler latch holes take about a 1/4 in shackle; measure yours.
- Does a latch lock stop theft?
- Only from your hitched vehicle. An unhitched trailer needs a coupler or wheel lock.
- Can I tow with a latch lock fitted?
- Many owners do, as it replaces the safety pin. Make sure it fully closes the latch and will not vibrate loose.