New '17 3500 SRW fifth wheel hitch options...San Diego

From my experience the rails only rarely get in the way. More often than in the way they make for handy tie down points. Once other nice thing about the rails is there are a number of gooseneck ball setups that mount to them so you don't have to mess around with installing the center ball if or when you want to tow a gooseneck style trailer.

Examples