This photo from the late(?) 1950s shows a line of M-38A1s as Tooele, Utah’s, Army Depot.
“Jeep rebuilding area, Tooele Ordnance Depot. Production line showing parts bins and supplies adjacent to line.”
http://content.lib.utah.edu/cdm/singleitem/collection/USHS_Class/id/25410/rec/2