Dust... I know about dust.
I'm from west Texas - now there's some dust. I've spent far too many hours in my youth on a tractor, and I can tell you that as Hans said, with an implement is down, there's dust. When the soil is wet or your on vegetation, there's not. On dirt roads, there's a buttload of it - unless of course there's been recent rain - which there's not a lot of in west Texas.
My problem with ground vehicles is not just the lack of dust/exhaust, but the scaling. Ground vehicles just appear too small. From gun film that I've seen, ground vehicles appeared much larger than they are rendered in AH. Fix that, and you may not need dust. I agree that there should be more terrain releif (ditches, treelines) for ground vehicles, but not unless the scaling is better.
[This message has been edited by TBone (edited 10-04-2000).]