Something maybe a side note or maybe the root of the Ground Vehicle "imbalance" in AH3. The terrains are FULL of trees and barriers to restrict visibility. The best way for success is to position vehicle in a "sniper" location nearest to a spawn or town or base and sit quietly.
Terrains (all terrains, regardless of their size) are huge in terms of places that a vehicle may go. Without some sort of aid, either in icon range, visibility, or the GV dar, the chances in locating a menacing threat becomes a lesson in futility way too often.
Why not have impregnable forests or swamps instead, to funnel the traffic through more lightly forested routes. This should open up the possibilities for larger and quicker battles.