Shop Best Master Coupler Locks for Trailers

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$63.69
Master Lock 378DAT Trailer Coupler Lock, 2-5/16-Inch
Amazon.com
911
Free shipping
$63.69
Master Lock 378DAT Trailer Coupler Lock, 2-5/16-Inch
Amazon.com
911
$40.73
Master Lock Black Universal Size Trailer Hitch Lock, Trailer Coupler Lock For Securing Rvs, Horse Trailers, Tool Trailers And More, 379ATPY
Amazon.com
3K+
Free shipping
$40.73
Master Lock Black Universal Size Trailer Hitch Lock, Trailer Coupler Lock For Securing Rvs, Horse Trailers, Tool Trailers And More, 379ATPY
Amazon.com
3K+
$30.00
Metal Trailer Lock - Keyed Alike, Yellow - ULINE
Uline
$30.00
Metal Trailer Lock - Keyed Alike, Yellow - ULINE
Uline
$30.00
Metal Trailer Lock - Keyed Alike, Blue - ULINE
Uline
$30.00
Metal Trailer Lock - Keyed Alike, Blue - ULINE
Uline
$89.99
2026 Upgraded Trailer Lock Fits 2-5/16 Inch Coupler, Heavy Duty Trailer Hitch Locks, Anti-Theft Trailer Coupler Lock For RV, Trailer, Boat, Pickup(Red
Amazon.com
Free shipping
$89.99
2026 Upgraded Trailer Lock Fits 2-5/16 Inch Coupler, Heavy Duty Trailer Hitch Locks, Anti-Theft Trailer Coupler Lock For RV, Trailer, Boat, Pickup(Red
Amazon.com
Free shipping
$39.99
Master Lock Universal Coupler Lock | For Trailers | By West Marine
WestMarine
404
$39.99
Master Lock Universal Coupler Lock | For Trailers | By West Marine
WestMarine
404
$146.30
Master Lock - (4) Keyed Alike Universal Trailer Coupler/Tongue Locks W/8 Keys, 379KA-4
Amazon.com
624
Free shipping
$146.30
Master Lock - (4) Keyed Alike Universal Trailer Coupler/Tongue Locks W/8 Keys, 379KA-4
Amazon.com
624
$34.99
Master Lock Lock And Adjustable Coupler Latch Lock Package | For Trailers | By West Marine
WestMarine
$34.99
Master Lock Lock And Adjustable Coupler Latch Lock Package | For Trailers | By West Marine
WestMarine
$87.79
$121.62
Master Lock - Universal Size Fits 1-7/8", 2", And 2-5/16" Couplers - Trailer Locks 389DAT, 3 Pack
Amazon.com
15K+
Free shipping
27% off
$87.79
$121.62
Master Lock - Universal Size Fits 1-7/8", 2", And 2-5/16" Couplers - Trailer Locks 389DAT, 3 Pack
Amazon.com
15K+
$17.99
Master Lock Adjustable Coupler Latch Lock | For Trailers | By West Marine
WestMarine
1
$17.99
Master Lock Adjustable Coupler Latch Lock | For Trailers | By West Marine
WestMarine
1
$12.33
Master Lock Trailer Lock, Stainless Steel Adjustable Coupler Latch Lock, 2847DAT
Amazon.com
2K+
$12.33
Master Lock Trailer Lock, Stainless Steel Adjustable Coupler Latch Lock, 2847DAT
Amazon.com
2K+
$78.49
Master Lock - (2) Keyed Alike Universal Trailer Coupler Locks W/4 Keys, 379KA-2
Amazon.com
384
Free shipping
$78.49
Master Lock - (2) Keyed Alike Universal Trailer Coupler Locks W/4 Keys, 379KA-2
Amazon.com
384
$25.08
Master Lock Trailer Coupler Latch Lock - 3-1/2" Span - 9/32" Diameter - Chrome ML94VR
etrailer.com
1K+
$25.08
Master Lock Trailer Coupler Latch Lock - 3-1/2" Span - 9/32" Diameter - Chrome ML94VR
etrailer.com
1K+
$214.96
Master Lock - (6) Keyed Alike Universal Trailer Coupler Locks W/12 Keys, 379KA-6
Amazon.com
674
Free shipping
$214.96
Master Lock - (6) Keyed Alike Universal Trailer Coupler Locks W/12 Keys, 379KA-6
Amazon.com
674
$9.99
METOWARE Trailer Coupler Lock Universal Adjustable Heavy-Duty Steel Trailer Hitch Lock, Anti Theft Trailer Ball Lock Towing Lock For Towing Trailer
Amazon.com
843
$9.99
METOWARE Trailer Coupler Lock Universal Adjustable Heavy-Duty Steel Trailer Hitch Lock, Anti Theft Trailer Ball Lock Towing Lock For Towing Trailer
Amazon.com
843
$32.99
TOPICK Universal Trailer Hitch Lock Set, Includes Heavy-Duty Coupler Ball Lock & Coupler Latch Lock, Keyed Alike, Anti-Theft, All-Weather Protection
Amazon.com
1
$32.99
TOPICK Universal Trailer Hitch Lock Set, Includes Heavy-Duty Coupler Ball Lock & Coupler Latch Lock, Keyed Alike, Anti-Theft, All-Weather Protection
Amazon.com
1
$57.62
Master Lock 2-5/16" Trailer Coupler Lock 378DAT
etrailer.com
3K+
$57.62
Master Lock 2-5/16" Trailer Coupler Lock 378DAT
etrailer.com
3K+
$105.27
Master Lock 3794DAT | Combination Trailer Lock Kit, Keyed Alike With Trailer Coupler/Receiver/Coupler Latch
AllDataResource.com
8
$105.27
Master Lock 3794DAT | Combination Trailer Lock Kit, Keyed Alike With Trailer Coupler/Receiver/Coupler Latch
AllDataResource.com
8
$84.90
VEVOR Trailer Coupler Lock Fits 2-5/16-Inch Cast/Bulldog Trailer Couplers Heavy Duty Trailer Hitch Lock With 3 Keys Corrision-Resistant Anti-Theft
VEVOR
$84.90
VEVOR Trailer Coupler Lock Fits 2-5/16-Inch Cast/Bulldog Trailer Couplers Heavy Duty Trailer Hitch Lock With 3 Keys Corrision-Resistant Anti-Theft
VEVOR
$108.81
Master Lock 3784DAT | Trailer Coupler Lock, Keyed Alike, Heavy Duty, 2-5/16", Laminated Steel
AllDataResource.com
11
$108.81
Master Lock 3784DAT | Trailer Coupler Lock, Keyed Alike, Heavy Duty, 2-5/16", Laminated Steel
AllDataResource.com
11
$128.90
Master Lock 379ATPY | Universal Trailer Coupler Lock, Keyed Different, Rekeyable Cylinder
AllDataResource.com
4K+
$128.90
Master Lock 379ATPY | Universal Trailer Coupler Lock, Keyed Different, Rekeyable Cylinder
AllDataResource.com
4K+
$45.99
Marshall Master Lock Trailer Coupler Lock | Camping World
Camping World
17K+
$45.99
Marshall Master Lock Trailer Coupler Lock | Camping World
Camping World
17K+
$61.65
Master Lock Universal Trailer Coupler Lock Keyed Alike To Key 0501 | 379KAATPY-0501
Lowe's
8
$61.65
Master Lock Universal Trailer Coupler Lock Keyed Alike To Key 0501 | 379KAATPY-0501
Lowe's
8
$69.99
Master Lock Receiver And Coupler Lock Kit, Model 3895DAT
Northern Tool
951
$69.99
Master Lock Receiver And Coupler Lock Kit, Model 3895DAT
Northern Tool
951
$384.95
The Icon Trailer Coupler Lock 2-5/16" Ball Extreme Duty Patented Anti-Theft Design
RecPro
Free shipping
$384.95
The Icon Trailer Coupler Lock 2-5/16" Ball Extreme Duty Patented Anti-Theft Design
RecPro
Free shipping
$34.99
Master Lock Universal Trailer Coupler Lock, Model 389DAT
Northern Tool
17K+
$34.99
Master Lock Universal Trailer Coupler Lock, Model 389DAT
Northern Tool
17K+
$66.00
Master Lock Heavy Duty Steel Padlock - Keyed Alike, 2 1/2" Shackle - Master Lock - Qty Of 3
Uline
$66.00
Master Lock Heavy Duty Steel Padlock - Keyed Alike, 2 1/2" Shackle - Master Lock - Qty Of 3
Uline
$42.99
Master Lock Stainless Steel Receiver Lock With Adjustable Coupler Latch Lock, 5/8in. (16Mm), Model 1481DAT
Northern Tool
483
$42.99
Master Lock Stainless Steel Receiver Lock With Adjustable Coupler Latch Lock, 5/8in. (16Mm), Model 1481DAT
Northern Tool
483
$12.99
Master Lock Solid Brass Coupler Latch Lock With 3/4 in. (19Mm) Shackle - 605DAT
Acme Tools
1K+
$12.99
Master Lock Solid Brass Coupler Latch Lock With 3/4 in. (19Mm) Shackle - 605DAT
Acme Tools
1K+
$41.99
Master Lock Trailer Coupler Lock - Red
Sportsmans Warehouse
17K+
$41.99
Master Lock Trailer Coupler Lock - Red
Sportsmans Warehouse
17K+
$106.00
Master Lock Trailer Lock, Trailer Coupler Lock, Fits 2-5/16 in.
eBay
8
Free shipping
$106.00
Master Lock Trailer Lock, Trailer Coupler Lock, Fits 2-5/16 in.
eBay
8
$45.00
Master Lock Universal Tailer Coupler Lock 1-7/8, 2, 2-5/16 389DAT NEW. Master Lock. Red. Other RV, Trailer & Camper Parts & Accessories.
eBay
34
Free shipping
$45.00
Master Lock Universal Tailer Coupler Lock 1-7/8, 2, 2-5/16 389DAT NEW. Master Lock. Red. Other RV, Trailer & Camper Parts & Accessories.
eBay
34
$50.00
Master Lock Universal Trailer Lock Fits 1-7/8" To 2-5/16" Coupler
eBay
30
Free shipping
$50.00
Master Lock Universal Trailer Lock Fits 1-7/8" To 2-5/16" Coupler
eBay
30
$34.55
Master Lock 1/2 in And 5/8 in Swivel Head Receiver Lock W/Ss Adj Coupler Latch Lock Stainless Steel One_Size | 2848DAT
Lowe's
$34.55
Master Lock 1/2 in And 5/8 in Swivel Head Receiver Lock W/Ss Adj Coupler Latch Lock Stainless Steel One_Size | 2848DAT
Lowe's
$59.79
Fulton Gorilla Guard Trailer Coupler Lock 63228
wholesalemarine
1K+
$59.79
Fulton Gorilla Guard Trailer Coupler Lock 63228
wholesalemarine
1K+
$60.95
Master Lock Gray Zinc Die Cast Coupler Lock
Airgas
1K+
$60.95
Master Lock Gray Zinc Die Cast Coupler Lock
Airgas
1K+
Master Lock Trailer Coupler Lock Review
2:50
Master Lock Trailer Coupler Lock Review
Oct 26, 2023
etrailer.com
Master Lock 2-5/16
1:48
Master Lock 2-5/16
Jan 28, 2014
etrailer.com
A Closer Look at the Master Lock Trailer Coupler Lock
2:21
A Closer Look at the Master Lock Trailer Coupler Lock
7 months ago
etrailer.com
Feature Breakdown: Master Lock Trailer Coupler Lock
3:08
Feature Breakdown: Master Lock Trailer Coupler Lock
Dec 21, 2015
etrailer.com
Master Lock Trailer Hitch Lock, Fits 1-7/8 in., 2 in., and Most 2-5/16 in. Trailer Couplers, Weather Resistant Automotive Hitch Lock with Keys, 377KA
0:45
Master Lock Trailer Hitch Lock, Fits 1-7/8 in., 2 in., and Most 2-5/16 in. Trailer Couplers, Weather Resistant Automotive Hitch Lock with Keys, 377KA
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amazon
Top 5 Best & Most Secure Trailer Hitch Locks • (2026 Reviews)
Top 5 Best & Most Secure Trailer Hitch Locks • (2026 Reviews)
Aug 2, 2020
antitheftboss.com
Can This Trailer Lock Stop a Lock Picker? | MotoMaster Test
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Can This Trailer Lock Stop a Lock Picker? | MotoMaster Test
1.5K views1 month ago
YouTubeSparrowsLockPicks
8:18
Best Trailer Hitch Locks in 2026 - Top 6 Hitch & Coupler Locks for RVs, Boats & More
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YouTubeYour Next Pick
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Lost Keys! Hitch Lock Replacement
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Removing Hitch Locking Pin
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4:55
(1537) TriMax UMAX50 Trailer Coupler Lock
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BOLT Off Vehicle Coupler Lock Attack Video
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YouTubeBOLT Lock
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Trailer Coupling Locks // Supercheap Auto
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DIY Travel Trailer Lock - How To Make
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How Do I Adjust My D-L Coupler? - FAQs
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Lock N'Load: Upgrading Your Trailer Lock
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YouTubeU-Haul Trailer Hitches And Towing
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U-Haul Stainless Coupler Lock: Review and Demo
10K viewsJun 4, 2021
YouTubeU-Haul Trailer Hitches And Towing
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(1532) Master Lock Trailer Couplers (379ATPY & 389DAT) (JUNK!)
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(1037) Master Lock 377 Trailer Hitch Lock (JUNK!)
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Interstate Trailer Defender High Security Coupler Lock
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The Best Trailer Lock Just Got Better!
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LockNLube VS safeLOCK - Best Locking Grease Coupler
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The Best Trailer Lock you can get!
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[660] Ramset vs. Reese Trailer Coupler Lock
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How To Fix Repair a Sticky or Stuck Trailer Coupler Tongue
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Best Lock Ever for Securing Your Trailer
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Shop Best Master Coupler Locks for Trailers

Sponsored
About our ads
$63.69
Master Lock 378DAT Trailer Coupler Lock, 2-5/16-Inch
Amazon.com
911
Free shipping
$63.69
Master Lock 378DAT Trailer Coupler Lock, 2-5/16-Inch
Amazon.com
911
$40.73
Master Lock Black Universal Size Trailer Hitch Lock, Trailer Coupler Lock For Securing Rvs, Horse Trailers, Tool Trailers And More, 379ATPY
Amazon.com
3K+
Free shipping
$40.73
Master Lock Black Universal Size Trailer Hitch Lock, Trailer Coupler Lock For Securing Rvs, Horse Trailers, Tool Trailers And More, 379ATPY
Amazon.com
3K+
$30.00
Metal Trailer Lock - Keyed Alike, Yellow - ULINE
Uline
$30.00
Metal Trailer Lock - Keyed Alike, Yellow - ULINE
Uline
$30.00
Metal Trailer Lock - Keyed Alike, Blue - ULINE
Uline
$30.00
Metal Trailer Lock - Keyed Alike, Blue - ULINE
Uline
$89.99
2026 Upgraded Trailer Lock Fits 2-5/16 Inch Coupler, Heavy Duty Trailer Hitch Locks, Anti-Theft Trailer Coupler Lock For RV, Trailer, Boat, Pickup(Red
Amazon.com
Free shipping
$89.99
2026 Upgraded Trailer Lock Fits 2-5/16 Inch Coupler, Heavy Duty Trailer Hitch Locks, Anti-Theft Trailer Coupler Lock For RV, Trailer, Boat, Pickup(Red
Amazon.com
Free shipping
$39.99
Master Lock Universal Coupler Lock | For Trailers | By West Marine
WestMarine
404
$39.99
Master Lock Universal Coupler Lock | For Trailers | By West Marine
WestMarine
404
$146.30
Master Lock - (4) Keyed Alike Universal Trailer Coupler/Tongue Locks W/8 Keys, 379KA-4
Amazon.com
624
Free shipping
$146.30
Master Lock - (4) Keyed Alike Universal Trailer Coupler/Tongue Locks W/8 Keys, 379KA-4
Amazon.com
624
$34.99
Master Lock Lock And Adjustable Coupler Latch Lock Package | For Trailers | By West Marine
WestMarine
$34.99
Master Lock Lock And Adjustable Coupler Latch Lock Package | For Trailers | By West Marine
WestMarine
$87.79
$121.62
Master Lock - Universal Size Fits 1-7/8", 2", And 2-5/16" Couplers - Trailer Locks 389DAT, 3 Pack
Amazon.com
15K+
Free shipping
27% off
$87.79
$121.62
Master Lock - Universal Size Fits 1-7/8", 2", And 2-5/16" Couplers - Trailer Locks 389DAT, 3 Pack
Amazon.com
15K+
$17.99
Master Lock Adjustable Coupler Latch Lock | For Trailers | By West Marine
WestMarine
1
$17.99
Master Lock Adjustable Coupler Latch Lock | For Trailers | By West Marine
WestMarine
1
$12.33
Master Lock Trailer Lock, Stainless Steel Adjustable Coupler Latch Lock, 2847DAT
Amazon.com
2K+
$12.33
Master Lock Trailer Lock, Stainless Steel Adjustable Coupler Latch Lock, 2847DAT
Amazon.com
2K+
$78.49
Master Lock - (2) Keyed Alike Universal Trailer Coupler Locks W/4 Keys, 379KA-2
Amazon.com
384
Free shipping
$78.49
Master Lock - (2) Keyed Alike Universal Trailer Coupler Locks W/4 Keys, 379KA-2
Amazon.com
384
$25.08
Master Lock Trailer Coupler Latch Lock - 3-1/2" Span - 9/32" Diameter - Chrome ML94VR
etrailer.com
1K+
$25.08
Master Lock Trailer Coupler Latch Lock - 3-1/2" Span - 9/32" Diameter - Chrome ML94VR
etrailer.com
1K+
$214.96
Master Lock - (6) Keyed Alike Universal Trailer Coupler Locks W/12 Keys, 379KA-6
Amazon.com
674
Free shipping
$214.96
Master Lock - (6) Keyed Alike Universal Trailer Coupler Locks W/12 Keys, 379KA-6
Amazon.com
674
$9.99
METOWARE Trailer Coupler Lock Universal Adjustable Heavy-Duty Steel Trailer Hitch Lock, Anti Theft Trailer Ball Lock Towing Lock For Towing Trailer
Amazon.com
843
$9.99
METOWARE Trailer Coupler Lock Universal Adjustable Heavy-Duty Steel Trailer Hitch Lock, Anti Theft Trailer Ball Lock Towing Lock For Towing Trailer
Amazon.com
843
$32.99
TOPICK Universal Trailer Hitch Lock Set, Includes Heavy-Duty Coupler Ball Lock & Coupler Latch Lock, Keyed Alike, Anti-Theft, All-Weather Protection
Amazon.com
1
$32.99
TOPICK Universal Trailer Hitch Lock Set, Includes Heavy-Duty Coupler Ball Lock & Coupler Latch Lock, Keyed Alike, Anti-Theft, All-Weather Protection
Amazon.com
1
$57.62
Master Lock 2-5/16" Trailer Coupler Lock 378DAT
etrailer.com
3K+
$57.62
Master Lock 2-5/16" Trailer Coupler Lock 378DAT
etrailer.com
3K+
$105.27
Master Lock 3794DAT | Combination Trailer Lock Kit, Keyed Alike With Trailer Coupler/Receiver/Coupler Latch
AllDataResource.com
8
$105.27
Master Lock 3794DAT | Combination Trailer Lock Kit, Keyed Alike With Trailer Coupler/Receiver/Coupler Latch
AllDataResource.com
8

  • 10 Best Trailer Coupler Locks - Our #1 Pick Will Surprise You

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