I think the 1 ton has more bed length than a 1/2 ton both in front of and behind the fenders.
I'm not sure I understand your plan though. Can you measure the two trucks your are trying to play with, what do you find?

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-