Regardless, what is a coupler lock used for? For that, you'd want a coupler lock. These U-shaped locks fit over the coupler on the trailer's tongue and prevents someone else from hooking up his vehicle to your trailer. Many have ball-shaped tops to go where the ball unit on your vehicle would normally go into the coupler.
Not only that, how do you lock a trailer so it can't be stolen?
How do you secure a trailer coupler?
BESTSELLER NO. 1 in 2021
Blaylock American Metal TL-20 Coupler Lock
For commercial and recreational use
Fits couplers 17/8-25/16"
Fits Hammer blow, Bulldog & RAM
Patented design ensures the most secure way to leave an unattended trailer
Molded exactly to fit the specific shape of your 2 5/16 inches trailer coupler when unhitched
Materials used by AMPLOCK provide good rust resistance for use in all climates
Easy to use with AMPLOCK’s push and lock system
The strongest lock to secure your trailer made with high quality materials and control and identification key system
Protect your trailer without worries with the best trailer coupler lock on market **Make sure you choose the right model for your trailer coupler size and type, referring to pictures provided (photos are for visual reference only) or to our website www.amplock.us **
BESTSELLER NO. 9 in 2021
Master Lock - 3-1/2" Long Shackle x 9/32" Diameter Pin, Coupler Latch Lock - Trailer Locks 1471DAT
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.
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
BESTSELLER NO. 10 in 2021
Bulldog Sliding Collar Coupler Lock Includes Trimax puck lock
Ultra High Security and fits the Bulldog sliding collar coupler pictured
A trailer coupler, in conjunction with a trailer ball, connects a trailer to your vehicle. ... It is designed to latch onto a trailer ball and articulate around it for smooth towing. Trailer couplers come in standard sizes, and many can be adjusted for a more secure connection.
It is used to connect your trailer to your tow vehicle hitch. How does this work? Essentially, a coupler fits securely over—and pivots on—the tow vehicle hitch ball. The coupler must be the same size and equal or greater weight capacity of the hitch ball to ensure a safe connection.