It's not arbitrary. The weight and speed have external impacts on road durability as well as air quality. Compare the amount of carbon dioxide released by a truck of that size and most other residential polluting machines and it doesn't come close.
If you want to push the cost of your hobby onto society by commiting tax fraud I don't think it's the democratically elected legislature that's at issue here.
If you want to push the cost of your hobby onto society by commiting tax fraud I don't think it's the democratically elected legislature that's at issue here.