Can i order 3 and get them keyed alike?

No, Each of key is unique, but not universal.

Is the 2 pack two complete pin assemblies, or just one of each size pin?

It is a single pin set with O rings to help properly size it, and it has two holes for the cotter pins to use depending on which size hitch you have.

could you remove some of the o rings so you could use the pin as extra safety on a 3 inch receiver?

I don't know about the extra safety on a 3 in receiver part of the question, but yes, you can remove the O rings (you could also add more if you were so inclined, and had some laying around)

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Coolrunner Trailer Hitch Lock Pin Set, 5/8" Extra Long Black Locking Hitch Pin, Heavy Duty Tow Hitch Receiver Lock with Anti-Rattle, Keys, Rubber Cap(5/8" Not Keyed Alike)

Product ID: 128536893

Details

Brand
Coolrunner
Vehicle Service Type
Trailer
Material
Iron Aluminum
Finish Type
Polished
Manufacturer
Coolrunner

🔒5/8" extra-long locking pin

🔧Push-to-lock design with 1/4-turn secure mechanism

🛡️Heavy-duty iron with rust-resistant black e-coating

Description

🔐 Lock in your peace of mind—tow smarter, not harder!

BUILT TO ENDURE - Heavy-duty iron construction with black e-coating ensures maximum rust and wear resistance for long-lasting durability.
EFFORTLESS LOCKING - Innovative push-to-lock design with a 1/4-turn mechanism and advanced Plum Blossom key for quick, secure access.
HEAVY HAULING READY - Solid hardened steel pin supports towing up to 20,000 lbs GTW—built for serious professionals on the move.
ANTI RATTLE PRECISION - Includes spring clip and 5 rubber O-rings to eliminate annoying hitch noise and keep your trailer rock-solid.
ULTIMATE HITCH SECURITY - Extra-long 5/8" diameter pin fits Class III-V hitches with 2" to 3" receivers for versatile, robust protection.

The Coolrunner Trailer Hitch Lock Pin Set features a 5/8" extra-long locking pin designed for Class III to V hitches with 2" to 3" receivers. Crafted from heavy-duty iron with a black e-coating, it offers superior rust and wear resistance. The set includes a spring clip and rubber O-rings to prevent rattling, while the push-to-lock design with a 1/4-turn Plum Blossom key ensures quick, secure locking. Rated to tow up to 20,000 lbs GTW, this lock pin set combines durability, security, and ease of use for professional-grade trailer protection.

Specifications

ASIN	B07Q5F7X8P
Automotive Fit Type	Universal Fit
Best Sellers Rank	#1,613,879 in Automotive ( See Top 100 in Automotive ) #952 in Towing Hitch Locks
Brand	Coolrunner
Brand Name	Coolrunner
Compatible with Vehicle Type	Trailer
Customer Reviews	4.6 out of 5 stars 432 Reviews
Finish Type	Polished
Manufacturer	Coolrunner
Manufacturer Part Number	CL-TrailerHitchLock
Material	Iron , Aluminum , Rubber
Material Type	Iron, Aluminum, Rubber
Model Number	CL-TrailerHitchLock
Number of Items	1
Pull Force	20000 pounds
Vehicle Service Type	Trailer

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