Feeders here were so much easier when we didn't have bears.....
Bears would be a challenge, could they jack up a hanging feeder on a tripod if legs are staked down well??
Or hanging from a tree limb. What about hanging from a cable strung between two trees?? I rig a winch up like this, use 3/8 all thread for ubolt. I have several like this. You can make to fit any size tree.
I have no bear experience, but don’t see how they could get to a feeder that hangs off a pulley on a cable that’s strung between two trees???