A-Frame Topwind Trailer Jack With Caster And Mounting Hardware Bulldog
(Bulldog Part #: JB-155032-14)

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Bulldog round jacks are recognized as the industry standard by leading agricultural, commercial, horse, livestock, and other trailer manufacturers. For more than three quarters of a century, Bulldog jacks have been demonstrated to be the most reliable, field-proven jacks on the market. This A-frame, topwind jack features 15 inches of travel and is ideal for RV, utility and agricultural styles of trailers. Rated for 5,000 pounds lift capacity. Kit includes Jack, 6" caster and mounting hardware.

  • Bulldog model number TWL 155 HD


Rating5,000 lbs
Travel15 inches
Extended (B)25.30 inches
Outer Tube2.25 inches
Inner Tube2 inches
Retracted (A)10.30 inches
Clearance (C)11-3/4 inches


  • 6" diameter, 2" wide Caster has a zinc plated finish
  • The High Strength Mounting Bracket Provides Easy Bolt-On or Weld-On Installation.


  • Jack
  • 6" diameter, 2" wide, thermoplastic caster
  • Mounting hardware

Not Included:


1919 - In a small third floor room over his car dealership in Wausau, Wisconsin, Thomas J. Jacob begins making high-quality precision tools of his own design. His venture becomes known as the Hammer Blow Tool Company. The death of a favorite hunting dog due to an accident involving a poorly-designed trailer hitch leads Jacob to develop the first drop-forged ball-and-socket trailer hitch, which he names the "Never Lets Go" Bull Dog. More inventions follow, positioning Hammer Blow at the forefront of the trailer industry at its infancy.

1930's - Demonstration models of camper trailers built by Jacob at the Chicago World's Fair set off a period of rapid growth in the industry.

1940's - Jacob dies in 1945. His wife, Lula, takes over Hammer Blow and guides it with great success for more than 20 years.

1960's - In 1967, Lula Jacob sells Hammer Blow to Neway Equipment Company of Muskegon, Michigan, which later sells to Lear Siegler, Inc.

1970's - In 1977, private investors led by Thomas J. Reinhart purchase and rename The HammerBlow Corporation. Expansion of the mechanical jack line and related products continues for more than a decade.

The above information has been provided by the Manufacturer, and we cannot guarantee the accuracy thereof or endorse the opinions expressed.