That foam stuff is post-haste. I've used it on 4 foot high chain link fence, but I have no idea how it would hold up a real 6 foot wood fence in 70km/hour winds. I can move my chain link posts around a bit. And supporting a swinging gate? I dunno, I wouldn't trust it for that. Mine definitely has a little wobble.
I've got a short section to do of wood fence, and I'll be using presure treated 4x4 and probably compacted road crush. The ground is, surprise surprise, clay, so I want drainage that concrete won't provide.
I've used 4x4 cedar posts as corners for garden boxes, and after 10 years they have disintegrate anywhere they contact dirt. Not proper gravel, I know, and kept moist for plants, but I'm not sure I'd trust it without really good drainage.
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