RE: Screw-in tree steps
I've got 12 loc on type stands an use treesteps in about half of them, the other half I use climbing sticks. Check out Gander Mountain, etc after hunting season and many times they have clearance on these items.
One other thing of note, I would suggest (through example) never to use any screw in tree step with a riveted hinge. I have had these rivets break on me and you dont want that to happen 20 feet up.