I would recommend the AAAction Adventure Camera Arm. It gives you a full 360 + degree range of motion because the pivot point is over your head rather than beside you. So there's nothing to get in your way as you trach the animal. It will hold more than 50 lbs, so it's plenty strong, it adjusts for tree lean forward or backward and right or left. It comes with the mounting strap and bow hanger to hang it while you're mounting is so you can use both hands to put the strap around the tree. You can see it at
www.aaactionadventure.com I've used it with a SOny PD170 and the Sony Z1U using my 501 fluid head.
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Karl Fisher Titration