Based on a Chevrolet Series 3000 ? Wheelbase seems short so maybe a 3442 chassis.
It is in the 3000 series. Chevy had an actual name for this chassis type (two words), but no problem if you don't know it. This is one of two models, but I highly suspect it's the smaller of the two. (Both are larger than the 3442 model.) Identify either of the two model numbers, as well as the name of the body, and the point is yours.