Playing tanks always feel like running against the clock, the clock being your ammo count.
Engineer can repair vehicules on the field, but nothing can help with ammo.
So ultimatly, a vehicule HAS TO drive all the way back to the main base. And because of that, i feel like it pushes player to either stay very close to the base with their Tanks, just so they can get ammo faster, or just run and die because they are too far from base and they are lazy to do a long trip.
I feel like adding a dedicated Vehicule supply drop that only support can do, would bring an other dynamic on how you CAN potentially play as Tank.
It would also add an other feature to the Support Class, wich by default is meant to supply players, so why not have an impact on vehicule aswell.
That Special supply air drop would be in the idea, probably very costly points wise, and having a very long CD before using an other one.
It would be a benefit but also with its own downside : it's an airdrop, so ennemies can see it, or even benefit themselve from it if they take over that area where the supply would be