You can get fence packages from Totem that will give you the right amount of lumber and, if I remember correctly, some diagrams to show you how to put it all together.
When we did our fence, we tried to get down to 3 feet. But thanks to clay and rock, some are 2.5 deep. Not ideal, but we broke an auger bit trying to go any further. Fence still stands 6 or 7 years later with no signs of tilting or sagging.
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