As in when you get re-supplied with vehicle supplies?
I too think that is a good idea. As it is, the only reward (which is good one, really) is the "thanks" and the hand shake you get from the person you just saved. At least with re-supplying bases/OBJ there are perk points to be earned.
One would have to think that based on the result of taking those supplies a point system could be designed. For instance, if just a resupply of ammo is he result then 1 pt (relative). But if the tank was turreted and low on ammo then 2 pts. If the tank was low on ammo, turreted, and tracked than 3 pts. And so on.
*shrugs*