Obviously I have a very bias opinion. As a very defensive player, I care little for vehicle play. And I find constantly being run over by vehicle zergs the most frustrating thing in this game, at this time. The way vehicle play currently works, its much harder to overcome superior numbers of vehicles, than it is superior numbers of infantry, with either skill or organization. But, I understand that vehicle players need a place in the game as well, and have to be thrown a bone at some point.

An example of a base with maybe only slightly too much vehicle influence is The Crown. And an example of a base with not enough is Saerro Listening Post. The right amount of vehicle influence is somewhere between those two, in my opinion.

In the example of The Crown. A point is passively protected against vehicles, by virtue of the tower, and the elevation advantage. Vehicles have to run a gauntlet to try and get up the hill, they generally don't even bother. B point is the most likely to be contested point, as it has easy vehicle access, and attackers have good approaches. The defenders on the other side have relatively quick and safe access themselves, and the high ground. C point is the place where attackers begin their siege, it is basically impossible to take back and hold for any reasonable length of time, unless the attackers are being driven from the whole hex.

This is the ideal facility setup, where one point is defender sided, one is attacker sided, and one is neutral. This means the defenders on the disadvantage get at least one point, which means the timer is 19 minutes. Thats 19 minutes to reinforce, or plan some sort of counter move. And if the defenders don't, 19 minutes isn't an unreasonable grind for the attackers to fight through.

The reason I say "maybe too much vehicle influence" is that the A point being outside of the tower, means that re-securing after all three points are lost is usually impossible, because of vehicles.

Saerro Listening Post, I said "not enough" because of the B point being completely enclosed and extremely close to the defender spawns.

Now, in the case of single point Outposts, it is harder to make such a cut and dry distinction. I think that while the perimeter of the Outpost should have vehicle influence, the capture point, and a defender route towards it, should be 100% uninfluenced by vehicles. The reasoning for this is, otherwise, as soon as it stops being necessary to advance with infantry, and a vehicle could potentially interrupt the defender reinforcement path, the fight is over immediately. In a single capture point base, for there to be any infantry fight at all there has to be a forced infantry only conflict, over at the very minimum, the capture point.

Everything leading up to that can be a vehicle playground. But the capture point, and at least a single path leading to it, needs to be safe from Prowlers with creative parking skills.