The super big ones are usually sign post rubs, every buck in the woods will rub them . I've seen a pine size of a basketball rubbed till it died. It was in fairly open timber and only little fellers would visit it in daylight.
I sat on one 3 days on a big cedar and watched the same little 4 pt spend a couple hours each day working it over.Big rubs on maples and beeches get my attention though.
