The U-shaped, 130-metric-ton "truck" has 28 wheels and is 10 meters wide, 20 meters long, and 6 meters high (33 by 66 by 20 feet) and will comfortably carry the 113-ton dishes for the array. When ALMA is completed in 2012, the field of 66 antennas will be as much as 15 kilometers (9 miles) wide.
The transport has passed its initial tests. Now it just needs some antennas to carry. I won't be surprised if sometime in the future it will be featured on the History Channel's Modern Marvels series. For details and more photos, see the ESO press release.