In the words of Cpl. Mouton. "One of the two trucks is believed to be a white Chevrolet Z-71 four-door pickup truck. The other is believed to be a GMC or Chevrolet with a bed cover." It is believed to be a Z-71 but they are not positive. http://planet1051.com/52912-press-conference-about-the-search-for-mickey-shunick-new-info/
With all due respect those are NOT his words as they are not in quotes in that article.