I have a fork mount clamped to the side of my pick-up truck which holds the front of the bike securely; however, the back wheel (which sits in the truck bed) slides during a trip. Does anyone know of an accessory that would hold the back wheel in place? I've been looking for some sort of tray with a clasp but haven't had any luck. John

Bungee cord. Wrap it around your seatpost and hook it under the lip of the bed rails. Worked for me.