I'm working on the final details on my GMC Duce and a half.

got a couple of obscure questions.

First reguarding the round Caution plates with the vehicles weights that was mounted on the front grill of WWII vehicles.

How widespread was this practice? (after D-Day) and

were all black lettering on Yellow background or were some just black lettering on the base olive drab color?

This was not a 'caution' plate but a bridge weight plate. They were always a yellow circle with black lettering and were fitted to all vehicles.

Cliff

Yes, they were widely used. They are actually used for bridge classification, so you don't put too much weight on a bridge and make it collapse when you go to drive across. They were still used in US Army up through the late '80s, especially in Europe. Standard color is yellow with black numbers. I have not seen them in any other manner.