I thought it might have been built for a mining company for off public hauling.
But, the color looks military. Maybe built specially for the Army?
Seems too wide for public roads maybe.

~Charley
1954 Chevy 3100 with 235
“Bud”
Follow along in the DITY
1963 Chevy half ton stepside short box 230
1954 GMC 3 ton 302
And several more Chevy camper and work trucks 1979 1987 1996