Best Gooseneck Trailer Locks
Our top picks
Proven Industries Model GRB-78
Made for Ram and Bulldog gooseneck couplers.
About $250
Check price at Proven ↗Proven Industries Model GDS
Made for Demco EZ Latch 4 in square couplers.
About $295
Check price at Proven ↗Blaylock TL-50
Fits several gooseneck brands.
Check current price
Check price at Blaylock ↗
Comparison
| Lock | Best for | Fits | Price (approx.) | |
|---|---|---|---|---|
| Proven Industries Model GRB-78 | Best for Ram/Bulldog | Ram and Bulldog gooseneck couplers (not Bulldog BX1) | About $250 | Check price ↗ |
| Proven Industries Model GDS | Best for Demco EZ Latch | 4 in square Demco gooseneck couplers with EZ Latch | About $295 | Check price ↗ |
| Blaylock TL-50 | Best for Hammerblow-style | Most Hammerblow, Stallion, Superior and T.E.M. gooseneck couplers | Check current price | Check price ↗ |
| AMPLock (coupler, gooseneck, kingpin, hitch, latch pin, door locks) | Best alternative custom-fit | 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 ↗ |
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
Proven Industries Model GRB-78
Who it is for: Ram/Bulldog gooseneck owners.
- Made for Ram and Bulldog gooseneck couplers
- 1/4 in steel, puck lock
- Does not fit Bulldog BX1
- Premium price
- Type: Gooseneck coupler lock
- Fits: Ram and Bulldog gooseneck couplers (not Bulldog BX1)
- Build: 1/4 in steel, puck lock
- Keyed alike: Yes
- Price: About $250
Confirm your coupler brand against Proven's fit images.
Check price at Proven ↗Proven Industries Model GDS
Who it is for: Demco EZ Latch gooseneck owners.
- Made for Demco EZ Latch 4 in square couplers
- Only fits that coupler
- Premium price
- Type: Gooseneck coupler lock
- Fits: 4 in square Demco gooseneck couplers with EZ Latch
- Build: 1/4 in steel, puck lock
- Keyed alike: Yes
- Price: About $295
Blaylock TL-50
Who it is for: Hammerblow/Stallion/Superior-style gooseneck owners.
- Fits several gooseneck brands
- Padlock not included
- Check your coupler brand
- Type: Gooseneck coupler lock (padlock required)
- Fits: Most Hammerblow, Stallion, Superior and T.E.M. gooseneck couplers
- Build: 3/4 in steel pin, rust-proof body
- Keyed alike: Depends on padlock
- Price: Check current price
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 ↗Identify your gooseneck coupler
Look on the coupler tube for the brand and model. Photograph it from the side and bottom. Most fit problems come from look-alike couplers, for example Bulldog BX1, which the GRB-78 does not fit.
What to look for
- Full enclosure of the coupler ball socket.
- Thick steel (Proven lists 1/4 in steel).
- Protected lock cylinder (puck lock or tubular).
- Keyed alike with your other locks.
Add a second layer
Gooseneck trailers often carry expensive equipment or livestock. A wheel lock and a GPS tracker are worth considering. See wheel locks.
Gooseneck coupler types at a glance
| Coupler style | How to recognise it | Lock approach |
|---|---|---|
| Bulldog / Ram style (round tube) | Brand cast or stamped on the tube; spring latch handle | Custom-fit steel lock (e.g. Proven GRB-78; not for Bulldog BX1) |
| Demco EZ Latch (4 in square) | Square tube with EZ Latch handle | Custom-fit lock for that coupler (e.g. Proven GDS) |
| Hammerblow, Stallion, Superior, T.E.M. | Brand plate on coupler | Bracket lock plus padlock (e.g. Blaylock TL-50) |
| Atwood and others | Check brand and model number | Use the maker's fit guide or send a photo before ordering |
Because gooseneck couplers vary so much, the safest buying step is to email the lock maker a photo. Proven and AMPLock both offer fit help on their sites.
Hitched vs unhitched
A gooseneck coupler lock protects the trailer when it is unhitched. When it is hitched to your truck, the gooseneck ball in the bed is the weak point; a pin or latch lock on the coupler handle stops someone releasing it at a fuel stop. Some owners also lock the bed ball or remove it when not towing.
Storage checklist for gooseneck trailers
- Fit the coupler lock every time the trailer is dropped, even for a short stop.
- Add a wheel lock on a visible outside wheel for multi-day storage.
- Lower the jack so the coupler sits low; it is harder to back a truck under.
- Photograph the VIN plate and keep serial numbers of equipment on board.
- Consider a hidden GPS tracker if the trailer carries machinery or livestock equipment.
Our pick
Proven Industries Model GRB-78: best for ram/bulldog. Ram/Bulldog gooseneck owners. If budget matters more, see the other picks above.
Check price at Proven ↗FAQs
- Is there a universal gooseneck lock?
- Not really; fit depends on coupler brand. Bracket-and-padlock designs like the Blaylock TL-50 cover several brands.
- Do 5th wheel and gooseneck locks differ?
- Yes. A 5th wheel uses a king pin lock; a gooseneck uses a coupler lock.
- How much does a gooseneck lock cost?
- Custom-fit steel models are roughly $250 to $300; bracket types cost less plus a padlock.
- Does the Proven GRB-78 fit Bulldog BX1?
- No. Proven states the GRB-78 is not compatible with Bulldog BX1 couplers.