I ran into a couple situations on neighborhood roads with a weight limit, and at the time in the heat of the moment I completely blanked on my weight... so i made up a simple paper one on the computer and printed it, and stuck it to my dash with some museum putty I had handy. So far so good, but yours is a good idea, the phenolic one will look much better.
Re overpass clearances.... I remember when all bridges seeded to be marked with their heights. Not so anymore in FL. You just have to ass-u-me that it's ok..... I noticed in TX recently, that everything is marked with a height.
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