Well, I finally landed a copy of Hunnicutt's Abrams book today - which also covers the development of the MBT-70. After glancing through a couple of times, I cannot see anywhere it describes some of the "boxes" I've seen on the MBT-70 at Aberdeen. In some cases, there were weights added to the different pilot vehicles to simulate full loads and such, but nothing that looks like the one displayed at Aberdeen. I thought that they might be storage boxes or something - but doesn't look like they open in any way. Anyone know what these are?
From Aberdeen:


and from Fort Knox (without boxes):


I think these are just the coolest looking tanks there are - sure wish someone would make a kit of these in 1:35 (plastic,resin or whatever)!
Thanks
cn