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Safe Towing With the Fortress™ Coupler Lock

The Fortress Coupler Lock provides heavy-duty protection against trailer theft with its solid steel construction and tamper-resistant design. Easy to install and built to last, it secures your trailer whether it’s parked or in storage—so you can tow with peace of mind.

What the Fortress™ Coupler Lock Can Do For You

The Fortress™ Coupler Lock is built to do one thing exceptionally well: protect your trailer from theft. Whether it’s parked at a job site, campsite, or outside your home, the Fortress™ helps you rest easier knowing your trailer isn’t going anywhere without you.

Made from hardened steel and designed to resist prying, picking, and drilling, this lock gives you serious peace of mind in just seconds. Once installed, it creates a visible deterrent that tells would-be thieves: “Not today.”

It’s fast to install, easy to remove with your key, and fits most standard couplers—so you get strong, reliable protection without any hassle.

Protect your investment. Prevent a nightmare. Lock it down with confidence. The Fortress™ Coupler Lock is how you stay in control—even when you’re not around.

An Essential Part of Your Towing Setup

The Fortress™ Coupler Lock is one of the smartest, most cost-effective ways to protect your trailer—and a piece of equipment no serious owner should go without. Built to resist picking, prying, and drilling, it transforms your coupler into a solid, theft-resistant barrier that keeps opportunists moving. It installs in seconds and creates instant visual deterrence, giving you security whether you’re parked overnight or for the season. For the price of a tank of gas, you get lasting peace of mind—and a lock that works as hard as you do to protect your investment.

Easy To Install

The Fortress™ Coupler Lock makes securing your trailer effortless. With a design focused on convenience and practicality, installation requires no complicated tools or extra parts. Simply slide it onto your coupler, engage the locking mechanism, and in seconds your trailer is safely protected. Whether you’re locking up at the campsite, job site, or driveway, the Fortress™ ensures a hassle-free, consistent experience every time. Its intuitive design means you spend less time fiddling with your lock and more time enjoying peace of mind.

Compact & Easy To Store

The Fortress™ Coupler Lock is compact enough to store neatly in your vehicle’s glovebox, toolbox, or storage compartment, making it accessible whenever and wherever you need it. Despite its robust build, it’s designed to minimize space requirements, ensuring your valuable storage areas remain uncluttered and organized. Lightweight but tough, it travels easily, keeping security at your fingertips without the bulk or inconvenience of larger locks. It’s the kind of reliable protection you can effortlessly keep on hand, ready to deploy at a moment’s notice.

Fortress™ Coupler Lock Specifications

Model: 86‑00‑5015 (Maximum Security Universal Coupler Lock)
Compatibility: Fits virtually all 1‑7/8″, 2″ & 2‑5/16″ trailer couplers
Material: Alloy steel with corrosion‑resistant finish
Dimensions: Approximately 3.28″ × 9.25″ × 9.25″
Weight: ~3 lbs (assembled product weight)
Lock Type: Cylinder/Key lock with barrel‑style keys (two included)
Security Features:
- Hardened U‑shackle and dual locking pins for pry resistance
- Front-facing lock cylinder and winged dust cover for weather resistance
- Engineered to resist drilling and picking
- Limited lifetime warranty
Included: Coupler lock and two keys
Recommended Use: Boats, RVs, utility trailers, horse trailers, travel trailers, ATVs, and more

The Industry Leader in Hitches & Towing Accessories

Equalizer Hitch continues to set the standard with a comprehensive lineup of products designed for safety, efficiency, and peace of mind on the road. The Chain Up Towing Accessory keeps your safety chains managed and ready at a moment’s notice, while the Fortress™ Coupler Lock delivers robust security, deterring theft wherever you park. The Flip™ Jack Foot adds built-in convenience, making trailer setup quick and hassle-free, and the SIMPLE WEIGH™ Tongue Scale gives you instant, reliable weight readings to ensure every trip is balanced and safe.

Innovation is at the core of Equalizer Hitch’s approach, demonstrated by the OnTarget™ Towing Tool, which uses laser accuracy to help you achieve perfect weight distribution every time you tow. Completing the lineup, the Zip™ Breakaway Cable provides a compact, tangle-free emergency solution that keeps you compliant and secure. With these advanced products, all engineered by Equalizer Hitch, you get the very best in towing safety and reliability—every mile, every journey.