[bcfcst4]

When we had free standing doors for our production of The Crucible (we had 4 of them, one for each act) we built frames on small bases of ply and put two pieces of ply (cut decoratively to match the door) against the frame, so viewed from above it looked like this |--|. We then attached two wheels to one side and a handle, so you could tip the door back onto your shoulder and wheel it on, with one person on back shouldering it and one person on the front guiding it. It worked really well, the only hard part was making sure the the frames were perfectly square. This was for doors that opened, I'm not sure if that's what you wanted.