Curt Marine Trailer Jack 1,000lbs 6" Wheel 10" Travel. CURT Trailer Jack with 6" wheel and 10" of maximum lifting height and vertical travel. 1,000lbs load capacity. Swivel bracket design allows for clearance while towing with a heavy duty pull pin to lock the jack in an upward position. Corrosion resistant zinc-plated finish. Includes mounting hardware to attach to trailer tongue.