JDSWMO - 6/8/2025 12:53
Tomcat - 6/8/2025 11:53
I believe they are considered an implement of husbandry
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This is almost the right answer.
They are an "implement of husbandry" learn that phrase, as long as you are empty you can go anywhere legally, if you are loaded with hay you can go anywhere legally.
Put a load of pipe on it and suddenly you are now an unlicenced vehicle.