Transport trailer with four wheel steering

A trailer adapted for transporting agricultural equipment over the ground and along a road, said trailer comprising

• an elongated frame including longitudinally extending frame members connected by a front cross frame member and a rear cross frame member,
• front wheels pivotally connected to said front cross frame member and rear wheels pivotally connected to said rear cross frame member,
• a steering system including a front crank member mounted on a front surface of said front cross frame member and supported for horizontal pivotal movement and further including a forwardly projecting tow bar connected to pivot said front crank member,
• a set of front tie rods pivotally connecting said front crank member to said front wheels for pivoting said front wheels in response to horizontal pivoting movement of said tow bar,
• said steering system further including a rear crank member mounted on a front surface of said rear cross frame member and supported for horizontal pivotal movement,
• a set of rear tie rods pivotally connecting said rear crank member to said rear wheels for pivoting said rear wheels in response to pivoting said rear crank member,
• a longitudinally extending elongated link member having a first end portion pivotally connected to said front crank member and a second end portion pivotally connected to said rear crank member and effective to pivot said rear wheels in response to pivoting said front wheels, and
• said link member extending substantially above bottom surfaces of said front cross frame member and said rear cross frame member and above and over said front cross frame member to protect said link member from being impacted by an object projecting above the ground.