Bulldog 183749 - 2-Speed Square Trailer Jack - 25,000 lbThe Industry's Strongest Drop Leg Jack. The BULLDOG Twin Cam features a convenient, enclosed pin mechanism with "twin cam" action that will quickly make this heavy duty, drop leg jack the industry standard. Twin Cam Drop Leg Mechanism. The BULLDOG Twin Cam Drop Leg mechanism allows an increase in the vertical static capacity by using two 3 4"" pins to transfer forces between the drop leg and inner tube of the jack. The unique Twin Cam drop leg