I think we are better off trying to balance around vehicles with the concept of time of engagement window.

Heavier the vehicle the longer the window when it likes it or not. Smaller vehicles have higher dictation of their own engagement window. However dedicated anti-vehicle infantry should always be allowed to FORCE widening the window. Half-arsed AV guys not so much but they can still contribute to the damage.

If the forced window is much longer than the pilot intended for then the vehicle would perish. So engaging and disengaging becomes an art form where the most amount of stressor of the opportunity to fight is going to be imposed by other vehicles.

There are tools in doing this, for example capacitor can be one thing, as long as the capacitor is all happy the HAV operator can keep his armor repper running indefinitely while becoming a slow moving all of death, however soon as he tries to over exert attacking and using speed he starts to overdrain and tax his capacitor to the point that his weapon may stop firing and the overdrive disegages and the armor repair unit offlines as well. The infantry can then throw down webifier grenades or EMP or cap drainers and the tank becomes really screwed. While all said equipment cannot be really carried by one person, one person with a great window of attack can and will still severely damage and kill the vehicle.

Ammo is another tool that can be used for window of engagement, very powerful weapons may have limited ammo so shots have to count. Modules could also be ammoed such as a ninite resistance coater or counter explosive armor or chaff. Without an ammo depot you can purposely exhaust a tank out of its ammo options forcing it to retreat and if caught by another vehicle fully stocked it will be in serious trouble.

The end goal I would like to see is LAV supporting squads and HAVs as well as being the speedy harasser for other vehicles poking the eyes out if you will.

HAVs will be structured and vehicle destroyer basically the battering ram in breaking up hostile squad formations and positions.

Dropships being transport and support.

Under no circumstances should any vehicle be soloist and giving vehicles to invincibly laugh off damage they eat in window far shorter than their engagement time is unacceptable. Vehicle down time should be near 1:1 of engagement time. If a tank is engaged for 3 minutes it should be 3 minutes out of commission a fresh tank should be brought to replace it as the other goes off to restock and recharge.