Proven Locks Model S175 2 in Trailer Hitch Lock - Heavy-Duty Security

In this review the Proven Locks Model S175 is evaluated for boat and trailer owners who need a tough coupler lock that fits select 2 in trailer couplers. The bottom line: this lock is for anyone who prioritizes physical resistance and a pick-resistant key system, offering a solid stainless steel locking pin inside a ductile iron shell with a black powder-coated exterior. It stands out because it focuses on mechanical strength and an innovative key design rather than lightweight convenience.

Key Features

• Heavy-duty construction: The ductile iron shell and solid stainless steel locking pin provide strong resistance to cutting and prying, keeping trailers and boats more secure.
• Powder-coated exterior: The black powder-coated finish adds corrosion resistance and a durable surface that resists weathering and wear.
• Pick-resistant key system: The unique key design reduces the risk of lock picking and includes an interior mechanism that discourages unauthorized key copying.
• Custom fit for 2 in couplers: The lock is built specifically to mount on select 2 in trailer couplers, ensuring a snug, dependable fit when matched to compatible hardware.
• Designed for towing security: The overall design prioritizes theft deterrence for trailers and boats where a robust coupler lock is a primary line of defense.

Who It's For

The Proven Locks Model S175 is best suited for owners of trailers, boats, and RVs that use a compatible 2 in coupler and who want a physically strong lock that resists bolt cutters and crowbars. It appeals to users who value mechanical strength and a key system that limits picking and unauthorized duplication.

It is less appropriate for someone who needs a universal fit across many different coupler sizes or who prefers a very lightweight travel lock; buyers should check coupler compatibility carefully before purchasing to ensure the custom fit matches their trailer.

Pros & Cons

Pros

• Very solid build quality with a stainless steel pin and ductile iron shell for excellent physical security.
• Exterior black powder coat resists corrosion and hides wear over time.
• Innovative key design that reduces pickability and discourages key copying.
• Good fit and functionality reported by customers for compatible trailers and easy installation when matched correctly.

Cons

• Only fits select 2 in couplers, so buyers must confirm compatibility before purchase.
• Some users reported mixed experience with the lock release mechanism, which can be sticky for a minority of units.

Specifications

Product type	Trailer hitch coupler lock
Model	Model S175
Coupler fit	Select 2 in couplers
Locking pin	Solid stainless steel
Body material	Ductile iron shell
Finish	Black powder-coated exterior
Key system	Unique pick-resistant design with interior anti-copy mechanism

Our Verdict

The Proven Locks Model S175 is a practical choice for trailer and boat owners with compatible 2 in couplers who want a durable, theft-deterrent coupler lock. Its solid stainless steel pin, ductile iron shell and pick-resistant key system make it a good value for those prioritizing robust physical security, provided the lock matches the trailer's coupler size.

Frequently Asked Questions

Will this lock fit all 2 in trailer couplers?
It fits select 2 in couplers only; confirm your coupler dimensions and compatibility before purchasing.

Is the lock weather resistant?
Yes, the black powder-coated exterior and stainless steel pin help resist corrosion and weathering.

Can the key be duplicated easily?
The lock uses a special key and an interior anti-copy mechanism designed to reduce the chance of unauthorized duplication.