Never pulled one with a tree hoist, but my dad let me setup a outside A frame engine hoist in our backyard, and it got used a lot by me and my friends. It had 8"x8" upright posts, an I beam top cross piece, and 4"x4"s for the angled braces on the uprights. When I came home from the service it was still there, and we used it again. But sometime after I moved out it disappeared, and I never asked where it went. Figured dad tore it down, or gave it away? He wasn't a car guy, and neither were my three brothers.