Major height adjustments are made by simply moving the adjustable foot pads inward or outward; minor adjustments are made at the screw level with the provided stabilizing adjusting lever. Designed for use with 5th wheel trailers whose coaches have a king pin height of 39 Inch to 50 Inch. Fully assembled with steel tube construction. Lockable for added security. Designed to allow use of padlock to secure Stabilizing Jack to trailer. 5000 Pound maximum load capacity.