Hey all. The house I just moved into has ONE really nice tree I have permission from the other half (she owns the house ) to do whatever is needed to give me a place to hang. I'm figuring a treated 10' post concreted 3' deep. Would a 4x6 be overkill or would a 4x4 be ok? Either way I'm going to put a eye screw near the top with rope staked out to the backside of it. Suggestions?