Fulton innovation the Fulton F2 is an entirely new generation of jack technology. Precision extruded aluminum alloy inner & outer tubes Revolutionary adjustable mount & swivel system. Smooth wheel performance. Twin track 7" diameter wheels are designed to roll independently to make changing direction smooth and effortless. 5-1/2" wide wheel base adds superior stability. Designed to eliminate the need for lubrication and maintenance. Mounts on 3" and 4" tongues. 1600-Lb. capacity 10" screw travel. 8" mount travel.