Designed for short bed trucks to provide turning clearance and prevent damage to truck and trailer in tight spaces at low speeds Designed for 15K, 16K Select Series & 18K Select Plus Series10" travel front to backCompatible with Reese base railsAdjustable with trailer attachedCan be used with full-sizeReese recommends the use of 13" minimum extended pin box on trailer#30035 rail & installation kit sold separately Will not fit trucks with beds shorter than 6' in length & Flareside/Stepside.