I think it would depend on the type of tree and its age. Our saddlebacks uprooted and destroyed every bay tree we had in our copse, including mature ones, but they grow like weeds round here so not a big deal. They also killed our two Robinia trees, but oddly enough, by eating the bark all round rather than uprooting them. In the orchard they uprooted all the self seeded apple and plum saplings, but left the mature trees intact. Ditto in the woodland - young trees with trunk diameters under 2 inches all went, older trees usually survived, presumably as their roots go much deeper.