The 1996 Ford Adrenalin concept served as an amuse bouche, of sorts, for the 2001 Explorer Sport Trac production vehicle. With four full doors and a smallish, sub–F-150 stature, the Adrenalin also previewed the truck market’s migration toward passenger comfort rather than outright capability. Its connection to the Sport Trac is plainly obvious in the styling of the rear end, but unlike the production vehicle, the Adrenalin concept also offered a retractable rear window and folding rear bulkhead, expanding cargo space beyond the bed. Chevrolet’s Avalanche would offer a similar feature when it arrived for 2002.