Mike,
True, but I have found that locking casters are a pain to deal with and are not nearly as free from movement as I'd like. I have the room too, mine is mounted on rubber leveling pads. I can visualize fighting press location while using it with casters, I'd struggle with that. To me it is like a vice, needs to be solid and to hold the work in one place. I can put some big and awkward parts in my press. I have on rare occasions pivoted (walked) the press on the leveling pads to gain some extra room. Now mind you, my press is only a little 12 ton HF.