Create XP hierarchy for different vehicles.

Currently you get 100xp from taking out an quad, and you get the same 100xp for taking out the Apache.

There should be clear hierarchy for the vehicles.

Snipers can get 1k XP from one kill, but as an engineer i could take out 10 Apaches or 10 tanks to get the same amount.

I think your contribution to the team should be reflected in the vehicles you take out.