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We always used a large tractor rim stood up with the chain routed over it to pull up t-posts, fence posts, clothes-line posts, small stumps, etc..
It's really basic geometry.
Here's the basic concept: https://www.youtube.com/watch?v=eHC-AA1xj4w
Obviously, the larger the rim, the more upward force you're applying, which is what you want.
GB :)
Well the size of the rim doesn't change the amount of force. In this one the tire was on top of the root system, so they were fighting themselves or it would have come out easier.