All registered, still on the lookout for some 1951 plates but no rush.

Here's a map with very nearly our entire rout except we clipped the southwest corner of Nebraska before getting to Colorado. Google maps now now only allows a limited number of stops and alterations otherwise I'd fix it.
https://goo.gl/maps/xJLJ9qhcprP2
The odometer shows 5,700 miles.
Fuel mileage loaded was about 13.5 in all cases. Total weight 18,400 lb leaving Idaho, similar starting out headed east, and another 1,000 lb or so on the truck bed from Minnesota back home.
Mileage for about 1,200 miles with empty trailer running on only two wheels from Denver to Coeur d'Alene: 15.3 MPG

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-