A tandem dump with air brakes, I'm not sure how farm plates in MN, may change things, and maybe I am wrong, but if you are over 26,000 lbs on the gross vehicle weight, I'd have to say you need at least a class B CDL. On the inspection, besides what the law may require, you had best make sure those brakes are in good working condition and properly adjusted, fil, gravel, crushed stone and similar materials, depending on moisture and density of the aggregate, can be quite heavy, you may not need to be heaped over the sides to be over. No fun to haul fill with poor brakes. It could be possible that you may need a D.O.T. number even with the farm plates, my neighbor runs a tandem with a big 30 yd box for grain and other things and he's up over the 26,000 lb line, so the CDL and the D.O.T. number is required, he's got agricultural plates, farm plates limit your travel and require a specified route, maybe your DMV is set up like that and I am incorrect. Best to check with them and see. One good thing is that you are out of the main path it seems, and is probably flat terrain, but still, you'll know you have a load on when hauling fill, so take care of those brakes, and don't get greedy with the loads, keep em within the limits, especially at first, until you get the feel of the truck, it's a real bad feeling to not be able to stop, with a heavy load, been there and done that. I am curious about this topic too, as I run an old F-600 for light hauling, and have just a NYS inspection, agriculture plates, it's in good running condition, but I am curious about the D.O.T. requirements, have not asked DMV here, and they told me nothing when I put it on the road.
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