Would be the same as for building stuff: ("Earned 1 rank point for repairing 100 units worth.") Possible recycling version: "Earned 1 rank point for recycling 100 units worth." ...Creative, right? Would make recycling more rewarding. I saw enough engies just ignoring fucktons of carcasses worth several thousand resources. Seriously.
I agree with this suggestion, but I believe that recycling vehicle carcasses in general should be incentivized more strongly. Currently, the opportunity cost of recycling a tank if you're a vehicle more often than not far outweighs any potential benefit you gain by recycling an enemy tank, and I find myself not often taking advantage of this until the other team at least gets good mediums/heavies.