REESE Adjustable Trailer Coupler Lock, Yellow/Chrome — Fits 1-7/8", 2" & 2-5/16", Heavy-Duty Steel

REESE Towpower 72783 is a universal, adjustable coupler lock built from heavy-duty steel and aluminum to secure 1-7/8", 2", and 2-5/16" trailer couplers and deter theft.

This coupler lock combines a weather-resistant aluminum body, a strong steel locking bar, and a bright finish to make your trailer harder to steal and easier to spot. Designed for storage and short-term protection, the ratchet-style mechanism offers 11 locking positions so the same lock adapts to common coupler sizes. It ships with two keys and fits most ball-type trailer couplers used on utility trailers, RVs, and boat trailers.

How does this lock adapt to different coupler sizes?

The REESE Towpower 72783 uses a ratchet-adjustable locking bar with eleven positions that let you fine-tune the fit for 1-7/8", 2", and 2-5/16" couplers. Simply insert the bar and ratchet it to the position that brings the shackle holes into alignment.

• Adjustable ratchet system with 11 settings for multiple coupler diameters.
• Shackle hole spacing centers at 4-1/2" for stable locking engagement.
• Small footprint that fits most standard ball-type couplers without long overhang.

What materials and design features resist tampering and weather?

The lock pairs an aluminum alloy body with a heavy-duty steel lock bar to balance corrosion resistance and mechanical strength. A bright yellow powder coat improves visibility and adds a weather-resistant finish that stands up to outdoor storage conditions.

• Aluminum alloy body for rust resistance and lighter weight.
• Steel locking bar to withstand cutting and prying forces.
• Yellow powder coating for visibility and extra corrosion protection.

How easy is it to install, carry, and use day-to-day?

Installation is tool-free and quick: position the lock over the coupler, ratchet to lock, and turn the key. Its compact size and simple action make it a practical accessory for frequent hookups and storage security.

• Tool-free ratchet installation and removal for fast use.
• Includes two keys so you have a spare on hand.
• Compact 9 x 9 x 3-inch footprint for convenient storage and transport.

Will this prevent all types of trailer theft?

No single device can make a trailer completely theft-proof, but this lock increases the time, noise, and effort required to steal a trailer—often deterring opportunistic thieves. It’s intended as part of a layered security approach, including hitch chains, wheel locks, and secure storage when possible.

• Acts as a visible deterrent against casual thieves and tow-away attempts.
• Designed to resist picking, prying, and drill attacks compared with cheap locks.
• Works best combined with other security measures for long-term protection.

Who this is for: The REESE Towpower 72783 is aimed at trailer, camper, and boat owners who need a reliable, easy-to-use coupler lock for storage or short-term parking. It’s well suited to RV owners, landscapers, contractors, and weekend boaters who value a visible deterrent, straightforward installation, and compatibility with the most common coupler sizes.