What if I want to use 3/4 minus to pack the fence instead of concrete? This fence line will be replaced in approx. 2 years or so.. Will the concrete be a hassle to remove? Maybe just concrete the corner posts? I am in Salem, Oregon. We rarely freeze, just quite a bit of rain. Also, Stve mentioned the cone at the top..could you explain that a little more..I think I know what you mean, the angle at the top like a cone shape of concrete to drain water away from the post but what if I use gravel instead of concrete?Thanks for the help.