The one ton is a rare truck. Most people have never seen a bed and tailgate like that.
A Chevrolet Master Parts Manual shows DS as the designation for a one ton with a 134 1/2 inch wheelbase, 1946, Second Design.
The 6 in your ID number is the designation for the Oakland Calif. manufacturing plant. I'm not sure about the second S in your ID #.
Here is some info on your truck.
http://www.brads41-46chevys.com/id21.html
