Not Wells, that is Harley Earl, chief stylist at GM for I think about 30 years. The car is the 1938 Buick Y-Job, Earl drove it as his personal vehicle.
More Y-job,,,https://dyler.com/blog/256/how-did-the-world-s-first-concept-car-the-buick-y-job-come-about
My first thought was a lunch break during the filming of Jailhouse Rock...I've been wrong many times before though...
Having lunch during the shooting of "Love me tender" 1956. Just because he's sitting on the running board of the truck does not mean he drove it. Mick