Bulldog 190754 - Square Tube Trailer Jack - 8,000 lbBULLDOG's 8,000 lbs. support capacity square jack serves the agricultural, industrial, construction, horse livestock trailer, and utility cargo trailer markets. The compact design of these jacks makes them ideal for tight fitting applications where 3" and 4" square tube jacks are too big! Use the painted outer tube as the final finish or primer Zinc plated inner tube and drop leg 4. 7" Outer inner tube overlap results in optimal side load performance