Kit your truck, and carry your bike.
Mount a couple of the Thule Locking Low Rider Truck Mounts to any flat surface on your bed, and ditch the towel-over-the-tailgate method of carrying your downhill bikes to the trailhead. There’s no need to awkwardly let your bike slide around in the bed, or even hang your front wheel over the ’gate into traffic thanks to the Low Rider. Remove your front wheel, thread the fork onto the burly, all-metal 9mm mount, crank down the quick-release lock, and roll out.
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Can I buy just the locking pin? What is...
Can I buy just the locking pin? What is the diameter of the pin?
The pin or "skewer" as Thule calls it is 9mm... it has been discontinued as a spare part from Thule but you might be able to find it on the net or elseware, heres the Thule part # (9mm Skewer 8535276)
etrailer has a few replacment locking skewers.