What I want for vehicles?

Lower Ammo Count

What's the point of having ammo if you have no need for re-supplying? Along with this, there should be an actual incentive to run an Ammunition module, and to skill into the Turret Ammunition skill.

As it stands, I rarely ever have to resupply; and on the rare occasion that I do; I simply recall my tank and call it back in for 100% ammo

However, Supply Depots need to be more prevalent on maps, and they need to be easily accessible by vehicles. And while we are at it, why not create a way to tell how much ammo your small turrets have?
Agreed 100%

Lowered Blaster Turret Range

When I'm in my Blaster tank, I can easily and reliably kill infantry from about 120m (I'm not too familiar with the metric system, so please forgive me if this is off). If AVers aren't allowed to fire at vehicles with near impunity, then neither should vehicle pilots.
Agreed 100%
No Hardener Stacking

I don't see how this was allowed in the first place. CCP's current Philosophy is "Waves of Opportunity." You shouldn't be allowed to have a never ending wave of opportunity, simply because your counter [AV] cannot extend their wave, nor make their wave indefinite. Agreed

Relevant AV Weapons

Swarm Launchers

Increase direct damage to 270HP per Swarm.

Increase lock range to 215m. However, since this is beyond rendering range I believe it would be fair if the vehicle pilot had an alarm system that alerts them if they are being locked onto beyond 175m. Countermeasures and Flares seems like a good idea as well. I'd rather see range to go up by more than 15m, maybe 250-300m total

Plasma Cannons

Increase Max Ammo count to 12.

Increase direct damage to: 1320/1650/1980. (STD/ADV/PRO)

It seems like a bit much, but it is a weapon that has a slow moving projectile, an arc, and only 1 round in the clip. It won't become overpowered against infantry like CCP fears simply because the only dropsuit that can survive a direct hit with an Allotek Plasma Cannon is a completely tanked out PRO heavy.

Agreed 100%

Proximity Explosives

Remove the alarm system. you can already look down to see the explosives, and the trap is completely static. Unlike Jihad Jeeps that can follow you, a Proximity Explosive trap requires someone to predict where you are. If you aren't piloting in a predictable pattern, then Proximity Explosives won't affect you.
Meh...

Remote Explosives

Increase Max. Carried amount. The total amount you can have active should be the total amount you can carry, just like other pieces of equipment. Otherwise, the only dropsuit that can create a reliable RE trap is the logistics. (This also applies to Proximity Explosives)
RE's are fine

Nerf Bolas

This AV weapon is ridiculously overpowered against Dropships as it can OHK them regardless of their fitting.. I say reduce it's direct damage to 200HP.

-HAND