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  • Bear's Truck Accessories. "What Size?" http://www.bearplugs.com/csite.php?page=5
  • ETrailer.com "Valley Universal Trailer Coupler Lock." http://www.youtube.com/watch?v=7u98q7VQQPE
  • Trailer Keeper. "Trailer Security Tip." http://www.trailerlock.com/securitytip.html
  • Trimax. "SXT3 Premium 100% Stainless Steel 5/8" Key Receiver Lock." http://www.trimaxlocks.com/_e/RECEIVER_LOCKING_PINS/product/SXT3/SXT3 _Premium_100_Stainless_Steel_5_8_Key_Receiver_Lock.htm