Factories used smaller trucks as on-site fire trucks.
Utility company could have ordered it.
Small tow truck.
If it was a fire truck, it could have been a small rural brush truck.
Could have been a municipality (city) vehicle, state or local, parks service, etc. etc. etc.
I've got a '62 Suburban that has a home made push bar incorporated into the front bumper and welded to the frame. It was originally a California Parks vehicle. It's a 1/2-ton truck, but came from the factory with a heavy-duty 7 blade fan, 3/4-ton heavy duty radiator, 283v8 and 4spd manual trans.
I dig the look of yours. I'm going to get rid of the push bar on mine, but I'm going to have the bumper restored and keep the assembly around...a friend is building a Bonneville race car, and this will be the push start truck.
-Brad