I'm guessing he has bought/selected the carport (prefab steel maybe) and this is assembly, still prob a day or two of assembly for a couple of handy men assuming the ground is ready.
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Agree a hoe is not the best for leveling but its a hell of a lot better for digging than a dozer or skid steer, so if you are only going to have one piece of equipment for the job hoe is the way to go, my 2c anyway