If you are still undecided, consider adding additional rails and have the top and bottom rail closer to the bitter end of each slat and have two spaced between the end ones. Use rails made from PT also. Use 2 x 6's cut in half (lenght) at a 45 degree angle. Then affix the rails to the posts with the angles slanting downwards. this retards ponding of water and makes it harder to climb the fence.
On the PT fence slats, make sure they are 1 x 6's and you use two zinc dipped screws per rail. So if you have four rails, the slat will have a total of 8 screws.
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