Recent acquisition, curious where this fits between the light and heavy trucks...it seems that the light trucks had the date code/WIS TRK on the top side, but this isn't the other style of tabbed heavy truck plates. Share what you know!!
The yellow plates were the "insert" truck plates, which were issued to heavy trucks over 8,000lbs (E-X weight codes) and light trucks for hire in the A-D weight classes. E, in this instance, indicates a weight of 8,001-10,000lbs.
One of the first plates in my collection. It was tacked up on the basement wall (from the previous home owners) until 2017 when my collection started with this plate.