Alot of people complain that vehicles are "too hard to kill" cause they retreat at the slightest sign of AV. The problem here is that allmost nobody has actually the balls to hunt them down. Which means you play AV for the entire match just to blow them up. Another problem is nobody bothers to actually team up or use existing resources and knowledge avaible. So lets talk about how to play AV:

-the stationary rock with a forgegun:
this is by far the most common way that AV players are chosing. Sitting in a spot and waiting for a vehicle to come by. Problem is that this method is easy to predict and aswell easy to counter. Which is basically wasting resources.

-The suicidal moron:
be it a heavy that runs stright at a tank or a medium frame with a swarm launcher. Attacking vehicles while there is hostile infantry around them is just suicidal and again waste of ISK cause you will die.

-Stealth AV:
Scouts with swarm launchers trying to sneak past infantry and attacking hostile vehicles. This can work but most of the time the ADS or tank will be aible to escape 8 out of 10 times.

-Organised AV play in combination with vehicles:
This might sound blasphemic but combining the mobility of a LAV/dropship with the firepower of forgeguns is devestating. However you will need a talented driver/pilot for this. If you do this with at least 2 forgegunners you can counter all vehicles without issues. The key is to actually get BEHIND a tank and follow it with some safety distance, once it stops moving you jump out with your buddy and start shoting the tank. Be sure to quickly escape with your vehicle once the job is done or angry infantry will come after you.

Out of all options the last one is the strategy which is the most successfull. You could argue about coordinated breach forgeguns but in most cases they just suck due to their long charge time. It is not the issue that AV doesnt work its more of a problem that people dont actually try to kill vehicles. Teamwork is the key and it is a joy to hunt tanks with a LAV.