Dutton-Lainson 3400 Swivel Trailer Jack Dutton-Lainson swivel jacks are easy to install and offers an excellent way to save you some effort when maneuvering a loaded trailer. Constructed from heavy gauge steel with a zinc plate finish for ultimate durability in all environments. This swivel trailer jack is easy to install and comes with all necessary bolt on mounting hardware required. The 6 diameter wheel is made of heavy duty polypropylene to resist flat spots and cold weather cracking for a l