I am putting a gate across my driveway which is 14ft between posts on either side. Its going to be wood and all 1x6 and 1x8 lumber to keep weight down. Each gate will be about 7ft long so I was thinking of putting a wheel at the end of both. I live in NH so Im sinking the post hole 4ft and the gate will be 4ft tall. Do I need to use a 6x6 and if so does the hole have to be 18in wide or can I do a 12in hole with a sonotube and concrete?
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