We've had an old Preston trailer sitting in the yard at work for a few years now, since Preston Trucking went out of business. I talked my wife into letting me bring it home to use as a shed, but the zoning in our neighborhood is too strict to allow it.
8 feet wide and 20 feet long and a roll up door! It would make an excellent storage building, once you took the wheels and axles off and set it on the ground. The container idea is even better, since it is already at ground level. There's a great deal for the price too.