The Huntington Digital Library has some more Kent Frost photos from his trips through Canyonlands and other southern Utah places. The photos represent two different trips. Most pics are from an October of 1955 jeep excursion, while one photo is from May of 1957.
This first photo from October of 1955 is a great photo that shows Kent and Fern Frost standing in front of a CJ-2A with a Porter & Reed hardtop. I’m not sure if this was one of their jeeps or not.