Shilo,
Might as well make it so you can drive a tank through anything at that rate.
Quit a few other bushes and clutter can be driven through now if you are not aware of it. Also, how close you have to get to a trunk has been pulled back even more. Without something to define stopping your tank whether it looks like small trees, a highway bill board, or a giant rock. You no longer have a tank game, instead a mario brothers game of run through the trees faster than the red guys while holding down on the fire button.
You should try this from my end building a terrain and tuning the micro terrain where I setup the tank combat. If you are being honest, you test every spawn you set down for drivability, cover, long range sighting and shooting. What you want, OK, then we just paint the world in grass and you can have at it Mr. Mario.
I doubt many of the converted AH2 to AH3 terrains were really slaved over at each spawn to determine what would happen once players got to spawn into all of the GV spawns. You can adjust the amount of cover to open space with a very narrow brush application of a grass while you then run a build and login offline to test that spawn in a tank. It just takes time and the willingness to invest it to make a fun outcome for the tank game.
It's not Hitech castrating trees that will solve this, it's terrain builders taking the time to tune every spawn for a tank battle. Here see all those spawns, I still have to visit them to do just what I'm talking about. I did the same on BowlMA.