We used the Andersen (rail mount) in a Sierra short 6.5 short bed to pull our fiver. We had the hitch with the ball in the rear-most position and the adapter turned so the socket was behind the pin. This put the weight just slightly behind the rear axle but shortened the swing radius of the pin box - which was what we needed to clear the bed rails on the sides in a tight turn. Handling wasn't an issue and we had no problems with cap-to-cab clearance on turns with our Grand Design Reflection. I'm speaking in past tense because we just traded trucks for a DRW long bed and had to get a different hitch to fit the Ford OEM puck system. I'm still a big fan of the Andersen, though.
Rob
