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I'm adding a new gate in my vinyl fence; a full width (6') gate.

I'm concerned about support. The fence posts are decently moored, but there is still some wiggle.

Would it be better to dig out and add additional concrete around the outside of the posts and keep the posts hollow?

Or would it be better to add a 4"x 4" wood post insert and moor it with some interior concrete to moor it?

Or is there another approach?

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I always use a 4x4 inside of vinyl posts to make sure they stay straight. Also, a six foot wide gate hooked to one post concerns me due to the weight and length. Since I don't how heavy your gate is I can't say how deep I would dig for the 4x4, but three feet, and one eight pound bag of concrete is what I'm guessing would keep the post straight. Also, I'd dig the hole bigger at the bottom for additional support. –  getterdun Jun 17 '14 at 2:16
@getterdun - make it an answer, and I'll accept. –  Jason Jun 17 '14 at 19:38
I'm tempted to suggest two 3' gates. I know that's less convenient for a car, but it avoids putting as long and heavy a lever-arm on the post. Or perhaps put a wheel at the far end of the gate... –  keshlam Oct 3 '14 at 4:58

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