For three years I've photo-captured bears climbing this rubbing tree. It 's about 14 inches in diameter and leans a bit. Cubs zip up and down the trunk, even on the underside, and adults occasionally tackle it too. It was a tree made for an arboreal camera trap, and promised a head-on view of a bear shimmying closer to the camera.
After hauling my aluminum extension ladder to the site in two pieces, I bolted two cameras on a 1" pipe lag-screwed to the tree with a threaded flange. With neighbor Ted passing the tools to and fro the installation wasn't life threatening. Here's a bear's eye view as seen from near the base. The cameras (a Browning and a GoPro) are 11.5' from the base and a vertical drop of 12'.
Bears visited the site 18 times, but only three looked up at the camera, and only the camera inspector climbed the tree.
To see the video copy this link https://vimeo.com/463652759 and paste it in your finder.