rautru,
Exposed Running Boards were available as an optional accessory for the 1956 thru 1959 Series 4, 6, 8 & 10 trucks. They are VERY rare on the 4000 (1-1/2 ton) & 6000 (2 ton) Series trucks.
The 8000 & 10000 Series 2-1/2 ton trucks had wider fenders with a flat bottom at the door and they didn't look right without the running boards, so most all of them got them.
The fire engine Bill posted a link to is my truck and those running boards were installed as part of the fire service body, not by Chevrolet.
ALL LCF's had running boards as standard issue.
You can seee running boards on my trucks linked below my signature.
Mike B
