The problem we have at present with ground vehicles is that most of the stuff we'd like to see in the arena would have no 'real' useful role.
examples would be armoured cars,trucks,jeeps etc etc
Well i have thought of one role for say the german half track vehicle(used for towing tigers etc i believe amongst other things

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At present we can reload our planes but ground vehicles are stuck with one ammo load and so you take your panzer for a 30 minute run to a base start destroying stuff and suddenly you are out of rounds with the choice of ditching or driving home(yeah right!!!).
Well how about adding the half tracks as ammo carriers? able to rearm the tanks on a strike? This would make ground assaults a more logistical event.
We could introduce trucks that could run fast from tank to tank rearming them.thus removing the present out of ammo=nothing to do problem.You could make these trucks highly explosive so that whilst rearming both vehicles are extremely vulnerable.eg hitting the truck sets off an explosion equal to a 1000lber.
another idea i was working on was the jeep.
a fast recon vehicle is one possible role but obviously it would need to have some sort of effect on the battle.
Well how about having a jeep in the vacinity of an enemy base increases damage done by rounds fired from tanks by a small percentage(better fire control from spotters).or perhaps with a jeep near your tank you are given better range on icons or are then able to get icons on ground vehicles.
just a few ideas ...feel free to destroy em

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Hazed
3./JG2