I assume it's wood or you would not be asking. Also assume the 6" side is vertical. Big chance to take. No one knows the age, where the knots are, internal rot/termites, type of wood, and as said, there are load limits for wood on the net..... If I were you I would get a cherry picker and a stand. Money well spent. New cherry picker or cylinder and a used stand. I use the picker for all kinds of stuff to save my back.
