This non-wheeled manual trailer jack has a 12000 lbs ultra-strong load capacity. Its thickened inner and outer carbon steel tubes with carbon steel base are durable. It offers 26.5 inches(Max.) custom height, 5-hole adjustment, and a smooth screw rod. Easy for one-person installation, suitable for RVs, utility trailers, yachts, etc. | Vevor | | Heavy-Duty Trailer Jack, 12,000 lbs Load Capacity, Sidewind Square Direct Weld-on Trailer Jack with Handle Crank | Black | Best Buy