Are they safety ring or true "split rims"...ie...two separate halves to the rim itself? I have seen a variety on 40's era trucks. Nearly all 20" x 5" but in different configurations. My '46 1.5 ton bus had mostly "standard" ten lug rims with safety rings but I discovered one of the rear (dually) was the notorious RH5 "widowmaker". Big difference between them.

Some pretty good discussion and info here...

Rim Info http://www.bigmacktrucks.com/topic/43135-split-rim-question/


1946 1.5-Ton Chevy Shorty Bus
In the Stovebolt Gallery
Tango's 1946 Chevy "Skoolie" Project
All my best --- Tango