The pre-positioned equipment is stored at Combat Equipment Companies. Through the 1990's I inspected seven of them every year for Physical Security. With the drawdown, five of them went away in my area of operations. They had everything you needed to provide a couple of battalions equipment, vehicles, tanks, weapons, supplies, food for specific type of units.
All very interesting, but since that time they have either moved to the US, are floating on ships, or some equipment has stayed there. They had full maintanance facilities to repair and test the equipment. {{Since the vast majority of the equipment is gone, I am not "giving" anything away.}}
BTW, while I was there they were selling excess Chevy and Dodge 3/4 ton 4x4's for $1,500, some had almost no miles and some had 60,000, as the vehicles were used for the old REFORGER Exercises and then later other exercises. I didn't buy one, although I could use one on the farm today!
Ed