Ball hitch security coupling. The only hitches that it does not fit are the caravan ones with built in stabilisers because they have a very large hitch head. Security kit for trailer and caravan couplings.
eBay
1pc/2pcs Password Lock Combination Lock 4 Digit Outdoor Waterproof Padlock For School Gym Locker, Sports Locker, Fence, Toolbox
Aliexpress UK
This trailer padlock is simple in design and very easy to install, no need for complicated tools and techniques, just plug in the ball joint and put it in the right position, finally lock it with the key.
eBay
Professional Tool Drill Bit Carbide Burr Lock Opener for Drilling Out Hard Lock Cylinders Locksmith Tools to open Locks
Aliexpress UK
11Pcs Locking Wheel Nut Remover Nut Bolt Stud Extractor Twist Socket Tool 9-19mm. A round heavy duty stainless steel padlock with 2 keys. Highly visible yellow colour. Easy manual installation. Revolving Leather Hole Punch Plier Puncher Tool For Belts Cut Eyelet 6 Sizes.
eBay
4Pcs Lock Cores for Thule Roof Racks Components One-Key System Lock Cylinders for Bike/Cargo/kayak Rack Roof with Lock Cylinder
Aliexpress UK
Universal Touring Caravan/Trailer Hitch Cover in Grey. HITCH COVER GREY.
eBay
Original Professional 12 In 1 HUK Lock Disassembly Tool Locksmith Tools Kit Remove Lock Repairing Pick Set Lock Cylinder Tools
Aliexpress UK
MILENCO BALL TYPE SECURITY HITCHLOCK,CARAVAN, TRAILER, HORSE AND BOAT TRAILER. Caravan Accessories. Fits all types of caravans, Boat & jet ski trailers. For maximum security this is supplied complete with Security Nuts to stop the removal of the hitch itself.
eBay
Smart Fingerprint Padlock Waterproof Biometric Fingerprint Keyless Door Lock USB Rechargeable Security Padlock for House Unlock
Aliexpress UK
Stronghold Al-Ko hitch lock. Comes with 3 keys. Lock is in full working order.
eBay
RAYKUBE TT Lock Bluetooth Smart Digital Wooden Cabinet Lock Drawer Lock with Password/Card/APP Unlock For Home/Gym/Hotel EM185
Aliexpress UK
The universal coupling hitch lock is a perfect solution to keeping your trailer and its belongings protected and secure. With recessed lock guard for added security. Supplied with 2 keys. Vehicle Parts & Accessories.
eBay
WIFI Smart Door Lock Biometric Fingerprint Door Lock Digital Electronic Lock with Password/Key/Keypad/ Fingerprint/ APP Unlock
Aliexpress UK
This trailer padlock is simple in design and very easy to install, no need for complicated tools and techniques, just plug in the ball joint and put it in the right position, finally lock it with the key.
eBay
LSIHI 2NI1 Style KABA Lock Open Tool Locksmiths tool Civil lock Core STainless Steel Lock Pick Tool
Aliexpress UK