I went back and looked at the original linked 1955 GMC Truck New Model and Features document I posted above and found on Page 50 of that booklet that the "400" Series models for 1955 had a 19,500lb GVW designation. That being said, I think ??? that the truck would have been at least a 2 Ton classification, but I don't have any other resource documents to confirm that. 1955.2 Series Chevrolet trucks that were rated as "2 Ton" in Chevrolet literature were assigned an 18,000lb GVW according to this similar resource document. Maybe the GMC 414 would have been rated as a "2-1/2 Ton"???

Perhaps that's another tidbit of info one of our GMC guys could provide an answer on???

~ Dan
1951 Chevy 3 window 3100
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"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)