B&W Companion Slider 5th Wheel Trailer RV Gooseneck Hitch Adapter RVK3405 The Companion Slider utilizes the B&W Turnoverball under-bed mounting system (Sold Separately). 12" of movement, for turning and maneuvering clearance in shortbed trucks. Automatically latches in both directions- only get out of the truck once to move into maneuvering po Three vertical adjustments, 17", 18", 19". Fully articulating coupler head allows front to back and side to side pivoting.