Datong tools is one of the best manufacturer in producing Trailer Jack and Ratchet Jack in this area. Our products enjoy below advantages:  1.1000 lbs lift capacity 2.10" lift travel, 13" retracted height, 23" extended height, 11" clearance height, 2" outer tube, 6" caster wheel. 3.Bolt on, side mount, fit trailer tongue up to 3.7"5x4.24". 4.Mounting hardware included as shown in picture. 5.Zinc plated suitable for marine application. 6.Fast production and shipping