Winds
This is a concern, but less so for this kind of design than for standard airships. The Aeroscraft is actually heavier than air, by at least a couple of hundred tons, so when sitting still on the ground, it will have less chance of being blown around. If it was going to be idle for a long time, the helium could be pumped into ground storage tanks to make it even heavier, although that would be a very tedious process.