Our 15 Favorites:
15 Best Boat Trailer Lock Reviews:
SaleBestseller No. 1 
Master Lock - Universal Size Fits 1-7/8", 2", and 2-5/16" Couplers - Trailer Locks #389DAT
- Coupler Lock,Universal
SaleBestseller No. 2 
CZC AUTO Black Trailer Hitch Coupler Lock, Dia 1/4 Inch, 3/4 Inch Span for Tow Boat RV Truck Car's Coupler (1 Pack, Black)
- CZC AUTO Trailer Hitch Coupler Locking Pin Design：1/4 Inch diameter tongue lock pin with effective length 3/4 Inch. Small size for easy carrying. Keeping the coupler lock in your pocket or vehicle anywhere that is fine. Please verify dimension and length of the pin you want before purchasing our coupler hitch lock pin.
- How To Operate Our Trailer Tongue Coupler Lock: Spinning the flat key 5-7 times to open or close the hitch lock.
- Security Of Our Coupler Locking Pin: This trailer lock is made of high-strength steel to deter theft. The hitch lock is coated with black electrophoretic paint to prevent corrosion.
- Coupler Locking Hitch Pin's Application: Tow Trailer Boat RV Truck Car
- CZC AUTO, a reliable brand in Hitch Sercurity Industry, we offer 30-day money-back for any reason, 12-month warranty for quality-related issues.
Bestseller No. 3 
Master Lock 1471DAT Trailer Coupler Latch Lock, 3-4/10" Long Shackle x 9/32" Diameter Pin
- This Master Lock protects and guards against tow-away theft. The lock works when the trailer is either connected to the tow vehicle or when the trailer is unattached. The lock prevents the coupler latch from moving, therefore preventing either the coupler to be removed from the ball, or not allowing a ball to be placed into the coupler.
- Fits UFP and surge brake couplers. K1 key blank
- Pin length or dimensional fit is 3-1/2" wide with a 9/32" diameter pin which is a standard size on virtually all couplers.
- Chrome plated for improved wear and corrosion resistance. It has a precision 4 pin tumbler mechanism that resists picking
- Weather Tough seal and water tight cap protects the lock from the elements
SaleBestseller No. 4 
Funmit Trailer Lock Universal Coupler Ball Lock Fits 1-7/8", 2", and 2-5/16" Couplers, Boat Camper Accessories for Travel Trailers Adjustable Heavy-Duty Steel Hitch Lock Yellow
- ✅FIT: Funmit trailer coupler lock are designed to fit snugly in 1-7/8”, 2”, 2-5/16” couplers and ratchet is adjustable with 11 locking positions. Each ratchet is tightly engaged with the lock body, it will never be pulled open by brute force like other coupler locks!
- ✅HIGH QUALITY: The u-shape trailer lock is made of heavy-duty solid /rigid A36 Steel and aluminum alloy,it's durable, rustproof and weatherproof. Passed QC product quality certification
- ✅SAFETY: The trailer hitch lock is made of high-quality materials and combines with the last anti-theft technology to ensuresafety,and the U-shape lock can resist picking, prying and drilling
- ✅CONVENIENT: It is easy and quick for you to install and remove,and bright yellow color can provide high visibility
- ✅WARRANTY 100%: The replacement trailer locks come with a 90 day manufacturer limited warranty back by Funmit, you can feel a 100% confident buy and enjoy a 24 hours pro tech online help any time
Bestseller No. 5 
Master Lock 379ATPY Universal Trailer Hitch Lock , Black
- Trailer hitch lock fits 1-7/8 in. (48mm), 2 in. (51mm) and most 2-5/16 in. (59mm) trailer couplers
- Trailer lock is best used for vehicles, trailers, and RVs
- Trailer coupler lock features advanced locking mechanism to resist picking and prying
- Trailer hitch lock is constructed from zinc to resist rust and corrosion
- Includes one trailer coupler lock, two keys
Bestseller No. 6 
Master Lock 605DAT Shackle 15/16" Length x 7/16" Inner Width, 2" Body Width, Solid Brass Coupler Lock
- Solid brass coupler latch lock with 3/4in (19mm) shackle
- Precision pin tumbler mechanism for superior pick resistance
- Resists rust and corrosion
- Lock design protects shackle from cutting and sawing
- Case hardened steel shackle
SaleBestseller No. 7 
REESE Towpower 72783 Coupler Lock, Adjustable Storage Security, Heavy-Duty Steel, Yellow and Chrome
- DIMENSIONS: 9” x 9” x 3”.Material:Steel
- BUILT TO LAST: The REESE Towpower Universal Coupler lock is a premium lock constructed with an aluminum body and heavy-duty steel lock bar. Distance between lock shackle holes center to center is 4-1/2 inch
- UNIVERSAL FIT: Ratchet design is adjustable with 11 locking positions and fits 1-⅞”, 2”, and 2-5/16” couplers.
- DETERS THEFT: Bright, deterrent yellow color is durable, highly visible, and an essential accessory to all types of trailers.
- SECURE PROTECTION: Easy-to-install lock resists picking, prying and drill outs. Guards against truck or trailer towaway theft in storage.
SaleBestseller No. 8 
Shoreline Marine Screw Type Brass Coupler Lock | Solid Brass & Stainless-Steel Pin
- Helps Prevent Theft
- Corrosion Resistant
- Screw Type
- Stainless Steel
- Two keys included
Bestseller No. 9 
METOWARE Trailer Tongue Coupler Lock 1/4" Dia, 3-1/2" Span, Trailer Hitch Lock for Latch-Type Coupler, Black Trailer Pin Lock for Towing Trailer RV Car Boat Truck (1 Pack)
- [Package Include] One lock pin ( 1/4" diameter&3-1/2 span) + one lock head( 361°rotating design& water proof rubber cap) + two tubular keys ( one for standby).
- [Security Guarantee] Made of heavy-duty steel, our trailer hitch is durably and strong. Its reinforced zinc alloy tubular lock core and stronger tubular keys improve the security.
- [Push-to-lock Design] Our trailer coupler lock is designed for easy operation. With the push-to-lock design, you can easily push to lock it without using key. To open it, just turn the key a little bit and the pin will pop out by itself.
- [Rust Protection& Durability] The electrophoretic paint on the surface of trailer pin lock with the addition of its watertight rubber cap, keep rust at bay even the lock always get soaked on any journey over wet or snowy roads, and keep the keyhole away from water and dirt.
- [Money Back Guarantee] Your satisfaction is what we strive for. If something goes wrong with your purchase, we will offer you a free replacement or a full refund. And if you have any question about the product, please feel free to contact us, click on 'Ask a question' button on the right hand side on this page and send us an email, we will make a quick and reliable response.
SaleBestseller No. 10 
METOWARE Trailer Coupler Lock Universal Adjustable Heavy-Duty Steel Trailer Hitch Lock, Anti Theft Trailer Ball Lock Towing Lock for Towing Trailer Security Fits 1-7/8",2”, 2-5/16" Coupler Yellow
- HEAVY DUTY TOW BALL COUPLER LOCK – It's a newly upgraded trailer coupler lock with all metal construction. The surface of lock body is frosted, non-slip, Wear-Resistant, and Rust-Proof.
- UNIVERSAL COMPATIBILITY – This universal trailer hitch security adjustable lock fits 1-7/8”,2”,2-5/16” couplers and ratchet is adjustable with 11 locking positions
- EASY TO USE – Metoware trailer lock set Ratchet design is adjustable with 11 locking positions. It is easy and quick for you to install and remove.
- SAFETY & HIGH QUALITY – The core of the lock is made of premium zinc alloy tubular and combines with the last anti-theft technology. The new design of the lock core makes it lock more secure.
- WARRANTY SERVICE – We warrant the quality of our products. If you are not satisfied with our lock within 30 days of your purchase, you will get all your money back or a replacement. In addition, a year of quality warranty is provided.
Bestseller No. 11 
Rhino USA Trailer Hitch Coupler Lock Kit (Includes 2" & 1/4" Couplers) Heavy Duty Anti-Theft Tongue Locks for Boat, RV, Travel Trailers & More - Reinforced Solid Steel for Ultimate Peace of Mind!
- AMERICAN OWNED, FAMILY OPERATED - Join the Rhino Family & Support a USA based Father/Son Business!
- PROTECTED FROM THE ELEMENTS - Powder Coated Protection Layer to Prevent Rust, Corrosion & Weathering
- FITS MOST 2 INCH COUPLERS - Maximum Coupler Lip Width 3-3/4" Maximum Coupler Lip Height is 3/8"
- CONFIDENCE & PEACE OF MIND - Knowing your Boats, Toy Hauler or Trailer is Protected From Theft.
- GUARANTEED 5-STAR EXPERIENCE - If you aren't 100% Satisfied for any Reason well Refund your Money
Bestseller No. 12 
Master Lock - (3) Keyed Alike Trailer & Multi Purpose Padlocks, 37KA-3
- This listing is for THREE (3) padlocks keyed alike (same key unlocks all) and six keys. The lock is also available with Bump Stop Technology. Search 37NKA in our storefront.
- APPLICATION: These padlocks are ideal for all outdoor applications when needing multiple locks that utilize ONLY one key. The #37 latch lock works well on 1-7/8 and 2 inch couplers and on virtually all standard hasp applications. These locks have a removable shackle sleeve. Sleeve off - Secures coupler latches. Sleeve on - Works best with hasps. KEY RETAINING - ensures that padlock is not left unlocked.
- PADLOCK FEATURES: 1-9/16"(21mm) wide x 3"(76mm) high. Armored Shackle Guard blocks bolt cutters. Revolving, case-hardened steel shackle sleeve resists cutting and sawing. Removable shackle sleeve. Sleeve off - Secures coupler latches to accommodate openings 9/32" (7mm) in diameter. Sleeve on - Works best with hasps, fits openings 1/2" (13mm) in diameter or larger. Precision pin tumbler mechanism resists picking.
- IMPORTANT NOTE: If using this style lock on a trailers coupler latch please be aware it is NOT recommended for all 2-5/16 couplers. It will fit some 2-5/16 couplers, the exception being 2-5/16 couplers that have the latch partially recessed from the top surface of the coupler, or latches that are wider than 7/8.
- ATTENTION: If you order two 3-packs they will NOT necessarily be keyed the same. To ensure you get two 3-packs keyed alike, you must order the 6-pack.
Bestseller No. 13 
METOWARE Trailer Coupler Lock, 1/4” Dia, 3/4” Span Heavy-Duty Steel Trailer Tongue Lock for Tow Boat RV Truck Car's Coupler with Anti-Rattle Rubber Rings (1 Pack)
- 【HIGH-QUALITY MATERIAL】- Made of premium strength steel and coated with electrophoretic paint, the trailer lock is durable and rust-proof. It is reliable for long-term hauling and secure for full protection, safely protecting your trailer, boat, camper and so on from theft.
- 【CONVENIENT TO CARRY】- Heavy-duty trailer hitch locks are powerful and mini (1/4” diameter, 3/4” span) -- convenient for you to carry, available to put in your pocket, bag, or vehicle anywhere. The coupler lock comes with 2x keys, so you can keep one for standby.
- 【EASY TO USE】- The trailer tongue lock is easy to operate with screw-type locking action -- just turn the key 5-7 times to open or lock, save your time and effort. The coupler lock can be installed quickly and easily so that you can hoop up and head out right away.
- 【UNIQUE DESIGN & SECURITY】- Solid trailer coupler lock ensures fast installation, maximum traction capacity and optimal appearance. In addition, this coupler lock has been carefully designed, machined and tested to provide you with confidence on your way forward. Also the trailer tongue lock fit most trailers, boat, ruck, cars for protected towing.
- 【MONEY BACK GUARANTEE】- Your satisfaction is what we strive for. If something goes wrong with the trailer coupler lock, we will offer you a free replacement or a full refund. And if you have any question about the trailer tongue lock, please feel free to contact us, click on 'Ask a question' button on the right hand side on this page and send us an email, we will make a quick and reliable response.
Bestseller No. 14 
CZC AUTO Trailer Lock 1/4" Dia, Trailer Coupler Lock 3-3/8" Span Trailer Tongue Lock Fits Latch-Type Coupler, Black Trailer Pin Lock with Keys for Towing Boat Truck Trailer RV Car
- WIDELY APPLICABLE: 1/4" trailer lock with a maximum 3-3/8'' effective span, CZC AUTO trailer coupler lock fits latch-type couplers for towing boat truck RV car. Please verify dimension and length of the pin before purchasing our trailer pin lock with keys
- EASY TO USE: CZC AUTO dogbone style hitch lock has a 360 degree rotating head, easy to handle. Simple push-to-lock design without key, after hearing "click", please pull the lock head again to make sure that it is locked. When you turn key to open the lock, the pin will pop up automatically. Convenient to use
- DEPENDABLE SECURITY: CZC AUTO trailer lock pin is made of carbon steel, solid and hard to bend. Coated with black electrophoretic paint to prevent corrosion. Zinc alloy tubular lock core & solid round key also help to improve security
- 2 KEYS INCLUDED: For convenience, our trailer hitch coupler lock comes with two keys. You can put the spare key in a separate location for emergencies. The watertight rubber cap keeps rain, snow, ice and dirt out. Kinds of weather can be handled
- WARRANTY: We offer 30-day money-back for any reason, 12-month warranty for quality-related issues. PLEASE NOTE: Any problem in using CZC AUTO trailer tongue lock, simply contact us, your problem will be solved within 24 HOURS
SaleBestseller No. 15 
Tevlaphee Universal Wheel Lock Heavy Duty Security Trailer Wheel Lock Tires Anti Theft for Car SUV Boat Motorcycle Golf Cart Great Deterrent Bright Color with 3 Keys (Red-Yellow)
- 🔐STRONG and DURABLE：Wheel clamp lock body is made of high strength steel plate. Crescent-shaped lock cylinder, compared to other general lock cylinder, its anti-theft performance is stronger! The surface of clamp is soft coated,which will not damage your car wheel.
- 🔐HIGHLY VISIBLE AND SAFE：The bright yellow and red color of car boot is a fine choice for maximum visibility in both day and night.The trailer wheel lock greatly reduces the possibility of being targeted by thieves and protects your car security effectively.
- 🔐WORKS WITH MOST VEHICLE：Universal wheel locks can be adjusted to fit 7 to 11 inch width tires for cars,camper, trucks, trailers motorcycles, ATV's, RV's, golf carts etc.Please make sure that the car wheel lock size fits your tire width.
- 🔐EASY TO INSTALL：Open the tire lock and install it on your trailer tire, adjust it to the appropriate hole, and push the lock cylinder.Unlock and remove the device also quickly.
- 🔐SUPERIOR CUSTOMER SERVICE：Each wheel lock set includes 1 Lock and 3 keys;If you are not satisfied with your purchase or have any other questions,please contact us! We are committed to providing all customers with attentive service and quality products! What are you waiting for?
Last update on 2023-01-12 / Affiliate links / Images from Amazon Product Advertising API