Tough and easy to use, the Side-Pin Heavy-Duty Square Jack from Buyers Products works great for RVs, construction trailers and triaxial trailers. The side-mounted pin features a spring return that makes both expansion and retraction easier. The 4-inch, black powder-coated tube is weather resistant and offers up to either 10,000 pounds of dynamic capacity, and up to 12,000 of static capacity. Please note that the front-pin version of this product should be used if you plan on using dual jacks.