I rented a stand on post hole digger. It was made by Bobcat and it had tracks on it. You drove it to the hole dug your hole and moved on. Much quicker than a two man auger. 400' you going to need at least 50 holes. You may even want to rent a small bobcat with an auger for that. While you at it see it they have the concrete mixer attachment.
Defintiely put 3 runners
Don't put Galvanized Hardware in pressure treated wood, i used some lag bolts for my runners and almost all of the lag bolts rotted out.
If you going to screw the boards on get a brad nailer, stick a nail in each runner then come back and screw it. Much quicker.
Torque head screws, make sure you get the one that are coated for use in pressure treated wood.
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