Bud Ekins' work truck with his, and Steve McQueen's, desert racers. I bet it's lettered by Von Dutch. He worked for Bud at one time, and did a lot of work for Steve, but I've never seen anyone discuss this truck before

the lettering looks just like the work Von Dutch did on Bud's Triumph dealership  http://justacarguy.blogspot.com/2017/03/bud-ekins-famous-movie-stuntman-and.html

Photos by John Dominis, Time Magazine

and there you have every single photo of the Ekins shop truck I can find. 

So, did no one think to save that Von Dutch'd truck? Damn. Probably not. It was probably sold to someone who repainted it, then sent it to the junkyard in the 70s

http://forums.pelicanparts.com/off-topic-discussions/391522-random-transportation-pictures-1189.html
https://selvedgeyard.com/2012/02/25/steve-mcqueen-doin-it-in-the-dirt-triumph-desert-bike-by-bud-ekins/
http://www.triumphrat.net/biker-hang-out/227559-1971-sport-illustrated-steve-mcqeen-6.html