Proven Industries Trailer Lock Review
Our top picks
Proven Industries Model 2516
Custom fit wraps the coupler, little room for tools.
$250 (provenlocks.com list)
Check price at Proven ↗Proven Industries Model 2178
Custom fit for 2 in couplers.
$250 (provenlocks.com list)
Check price at Proven ↗Proven Industries Model S175
Proven's lowest-priced coupler lock.
$120 (provenlocks.com list)
Check price at Proven ↗
Comparison
| Lock | Best for | Fits | Price (approx.) | |
|---|---|---|---|---|
| Proven Industries Model 2516 | 2-5/16 in trigger and thumb latch | Most 2-5/16 in trigger- and thumb-latch couplers | $250 (provenlocks.com list) | Check price ↗ |
| Proven Industries Model 2178 | Most popular: 2 in couplers | Most 2 in couplers | $250 (provenlocks.com list) | Check price ↗ |
| Proven Industries Model S175 | Most affordable: $120 | 2 in A-frame welded-on and straight bolt-on couplers (per maker) | $120 (provenlocks.com list) | Check price ↗ |
| Proven Industries Model GRB-78 | Ram and Bulldog gooseneck | Ram and Bulldog gooseneck couplers (not Bulldog BX1) | $250 (provenlocks.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
Proven Industries Model 2516
Who it is for: Owners of valuable 2-5/16 in trailers stored unattended.
- Custom fit wraps the coupler, little room for tools
- 1/4 in steel, tubular key
- Keyed-alike option across the range
- Can capture most safety chain hooks
- Expensive
- Must match your exact coupler model
- Heavy
- Type: Coupler lock (custom-fit)
- Fits: Most 2-5/16 in trigger- and thumb-latch couplers
- Build: 1/4 in steel, black powder coat, puck lock, 7-pin tubular key
- Keyed alike: Yes (keyed-alike option across Proven line)
- Price: $250 (provenlocks.com list)
Can secure most 5/16 in safety chain hooks per maker; check the fit index for your coupler.
Check price at Proven ↗Proven Industries Model 2178
Who it is for: Boat and utility trailers with 2 in couplers wanting top security.
- Custom fit for 2 in couplers
- 1/4 in steel
- Keyed-alike option
- Price not confirmed on our check
- Fit is coupler-specific
- Type: Coupler lock (custom-fit)
- Fits: Most 2 in couplers
- Build: 1/4 in steel, black powder coat, puck lock
- Keyed alike: Yes (keyed-alike option)
- Price: $250 (provenlocks.com list)
2 in version of Proven's coupler lock (spec per dealer listing at nctrailers.com).
Check price at Proven ↗Proven Industries Model S175
Who it is for: 2 in trailers wanting Proven quality on a smaller budget.
- Proven's lowest-priced coupler lock
- Fits A-frame and straight-tongue couplers
- Made in USA
- 2 in couplers only
- Slides over the flange rather than fully wrapping like the 2516
- Type: Coupler lock (slides over coupler flange)
- Fits: 2 in A-frame welded-on and straight bolt-on couplers (per maker)
- Build: Made in USA, Cobra tubular lock core standard, disc-detainer upgrade optional
- Keyed alike: Yes (keyed-alike option)
- Price: $120 (provenlocks.com list)
Proven calls it its most affordable coupler lock.
Check price at Proven ↗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: $250 (provenlocks.com list)
Confirm your coupler brand against Proven's fit images.
Check price at Proven ↗
Proven models and list prices
| Model | Fits (per Proven) | List price | Options |
|---|---|---|---|
| 2516 | Most 2-5/16 in trigger and thumb latch couplers; being updated from round to square style | $250 | Blue or black billet 6061 aluminum; solid 303 stainless +$100; keyed alike +$1 |
| 2178 | 2 in A-frame welded-on and straight bolt-on couplers | $250 | Same finish and stainless options |
| S175 | 2 in A-frame and straight couplers (slides over flange) | $120 | Disc-detainer core +$40 |
| GRB-78 | Ram and Bulldog gooseneck couplers (not Bulldog BX1) | $250 | Same finish and stainless options |
Lock cores
- Cobra 7-pin tubular comes standard; Proven says keys cannot be copied at a hardware store.
- Proven disc-detainer is an upgrade option (+$40 on the S175).
- Medeco M3 and Abloy are available on request at extra cost.
What Proven says you get
- Lifetime warranty.
- Lock bodies made in the USA.
- Keyed alike: every lock in one order can share a key.
- Same-day shipping on orders before 2pm EST.
- Fit help: Proven asks you to email a photo of your coupler if it is not in their fit index.
Things to check before buying
- Fit is coupler-specific; match your coupler to the fit index, not just the ball size.
- The 2516 holds most, not all, safety chain hooks, per Proven.
- Product photos may not show the current revision.
- Comparing brands? See AMPLock vs Proven or every option in the coupler lock hub.
Our position
We have not tested Proven locks and we publish no star ratings. This page summarises manufacturer information with links so you can verify it.
Sources
- Proven Industries Model 2516: https://www.provenlocks.com/products/model-2516
- Proven Industries Model 2178: https://www.provenlocks.com/products/model-2178
- Proven Industries Model S175: https://www.provenlocks.com/products/model-s175
- Proven Industries Model GRB-78: https://www.provenlocks.com/products/model-gb1
- Proven home page (lifetime warranty, made in USA, keyed alike, same-day shipping): https://www.provenlocks.com/
Prices and options checked on provenlocks.com on 22 October 2026. They change often; confirm on the maker site.
Our pick
Proven Industries Model 2516: 2-5/16 in trigger and thumb latch. Owners of valuable 2-5/16 in trailers stored unattended. If budget matters more, see the other picks above.
Check price at Proven ↗FAQs
- Are Proven trailer locks worth it?
- They cost more than universal locks ($120 to $350 at list) but are custom-fit, made in the USA and carry a lifetime warranty. Whether that is worth it depends on your trailer's value.
- Which Proven lock fits my trailer?
- 2-5/16 in trigger or thumb latch: 2516. 2 in A-frame or straight: 2178 or S175. Ram or Bulldog gooseneck: GRB-78. Check Proven's fit index first.
- Do Proven locks come keyed alike?
- Yes, for $1 extra per lock all locks in one order share a key.