I am buliding a new run and I already have some 6' cedar posts that I would like to reuse. I would like to use as much of the height above ground as possible so I don't have to bend over in the run. I live in a place where the ground will freeze and my DH insists they have to be 4' in the ground so as not to shift...which wouldn't make much sense as only 2' would be sticking out. (I will put netting over the top and can make it taller in the middle as there is a big tree I'm going to attach it to. It will be shaped like a circus tent, going higher to the tree.) As for the posts...I have holes dug about 18" right now and I was thinking of using quick-crete (sp?). Any thoughts are appreciated as this is my first time doing something like this!