This 5th wheel lock is made specifically for 5th wheel trailers. It easily slips over a 5th-wheel trailer’s kingpin and ensures that the trailer cannot be towed away without your permission. With a universal design, it is able to fit most 5th-wheel trailers on the market today. The CURT kingpin lock is made of strong aluminum and is key-operated. For all of your trailer security needs, look to CURT for the lock to keep that boat, RV, toy hauler — whatever it may be! — safe and sound.