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The Collar® Coupler Lock for Bulldog-style Couple


  • The ONLY lock on the market that will securely lock your Bulldog®, Butler or RAM coupler whether attached to or detached from a towing vehicle.
  • Also works on the RAM couplers appearing on many new trailers.
  • Works on all available coupler latch styles (high rise shown).
  • Constructed of corrosion resistant stainless steel.
  • Made in the U.S.A.
  • Works with a variety of different padlocks including 60mm or 70mm disk locks and the Master 37DAT
  • Will NOT fit the Fulton-style cast couplers being marketed under the "Bulldog" name (see pictures below to assure it will fit your coupler).

MSRP = $59.95 / $74.95 with disc padlock

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The Collar® was invented by a construction contractor that couldn't find a lock for his Bulldog® trailer coupler that would keep his trailer from being stolen off his truck. The Collar® was also designed to take a lot of abuse.

This is the new, improved model that fits all 2" and 2-5/16" couplers made by Bulldog and Ram!!

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  • Model: CM-TC-2
  • Shipping Weight: 1.5lbs
  • Manufactured by: Collar Marketing, LLC

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