The only side of the fence that I didn't replace this year was blown down last night. It is a 6ft fence at the top of a hill, the bottom of the posts were rotten. If I use 9ft concrete posts and 150mm concrete baseboards, do I have to use fence panels? They don't look strong enough to handle heavy winds with posts 1800mms apart. I'm wondering if I can buy heavy-duty panels or would you build your own? I don't want hit and miss for privacy reasons.