Towing & Hauling
The short answer
The best trailer hitch locks are heavy-duty, weather-sealed pin locks like the Master Lock 377DAT Receiver Lock and the CURT 23086 Coupler Lock, which prevent thieves from unhitching your trailer or stealing your hitch-mounted accessories.
Whether you're towing a boat, parked at a campsite, or just running into the store with a bike rack on your receiver, a hitch lock is cheap insurance against a very expensive loss. The right lock secures both your receiver pin and your trailer coupler so nothing walks off when your back is turned.
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Our top pick, best overall
Master Lock 377DAT Receiver Lock
A trusted, weather-protected receiver pin lock that fits most Class III–V hitches and secures bike racks, cargo carriers, and trailers alike.
A heavy-duty coupler lock that prevents a thief from latching your trailer onto their own ball — essential when leaving a trailer parked.
A combination set that includes both a receiver pin lock and a coupler lock, often keyed alike so you only manage one key.
A premium, ultra-tough receiver lock built from hardened steel with a deep weather cover — popular with boaters and RV owners.
Most full-size trucks and SUVs use a Class III, IV, or V hitch with a 2" receiver and a 5/8" pin. Smaller crossovers with 1-1/4" receivers typically use a 1/2" pin. Check your vehicle's owner's manual or measure the existing pin to confirm.
For maximum security, yes. A receiver lock keeps your hitch or bike rack from being slid out of the receiver, while a coupler lock prevents someone from hooking your unattended trailer up to their own ball and driving away.
It can if water gets into the keyway. Look for locks with rubber or shrouded weather caps, and apply a graphite or dry PTFE lubricant — not WD-40 — to keep the cylinder turning smoothly in cold weather.
They're not unbreakable, but they're a strong deterrent. Most trailer and hitch-accessory thefts are crimes of opportunity, and a thief will skip a locked rig in favor of an unlocked one nearby.
Yes — many brands like Master Lock, Reese, and Trimax offer keyed-alike sets so your receiver lock, coupler lock, and even your trailer storage locks all use the same key.
AXLY.pro is a free iPhone app that pairs with any Bluetooth OBD2 adapter to read codes, watch live engine data, and time your runs — so you fix the right thing before you buy parts.
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Top pick: Master Lock 377DAT Receiver Lock Check price
