We used to have a really big cottonwood three with several big branches in different directions. We used one limb for years to lift heavy things with a chain hoist hung from the limb.
Then we discovered rot in the crotch of the tree. Tied a cable to the limb and pulled with the HD7; that limb practically fell by itself as is was so rotten at the base.
After that we put up 2 large electric poles with a cross timber of three 2X12's to lift engines, especially off the back of the combines we had in those days.