Firefly,

The reason no one has answered your inquiry so far is that it's probably misplaced. It should have been posted into the main Trees Forum. Very few people ever visit this obscure sub-forum.

Anyway, my guess is that your three closely spaced trees are probably sprouts of one single tree. When seedling oaks are chopped off, they often resprout with multiple whips. Now, in the heat of summer, is probably the worst possible time to try to move it/them. If it were me, I'd wait until just after leaf drop, this coming fall.

Here is a link that might be useful: Planting a Tree or Shrub