Just my thought, but if the spare tire carrier is an indicator, that side swing unit would make this a 1951-53 bed and rear frame section. The 1947-50 under bed spare tire carriers had the center slide out support instead of the one that unhooked and swung out and down like is in your pictures.
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
niobrarafun, Since your topic is about a truck bed, it better fits into the Making a Stovebolt Bed forum, so it has been moved there for further/continued discussion.
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)