How about severly limiting the range at which the icon for ANY AFV appears, but add a nice dust trail behind it when it moves (anyone remember the little dust roostertail that followed the paratroopers in brand-W as they ran along the ground?). As soon as the vehicle stops (or slows below, say, 5 mph/8 kph) the dust trail disappears. This would also serve another valuable purpose, by showing the direction of the moving armor. Dust was a real factor in armor conflict, and could also serve to realistically complicate aiming at a cluster of moving AFVs in tank-to-tank situations. I'd also like to see smoke generators added, but this is probably beyond what HtC has in mind for vehicles in the game (not to mention the potential framerate hit).
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Sabre, a.k.a. Rojo
(S-2, The Buccaneers)