Don't think trucks are required to have a rear plate in Missouri.
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The smaller trucks are required to have two plates front and back , not sure where the break over is my 1500 has to have two.
If a truck is licensed for 18000 lbs and heavier, they only have a front plate. They usually pulling trailers.
It's 12,000 but other than that, you're right.
Section 301-130 License plates, required slogan and inf
Mo Dot wants them on the front so they can see what you are licensed for before you pull on the scales.