$12256 / $11500
On the start of each run, you would pick what kind of supplies you want (medicine, ammo, construction, food) and how many of them, and then conveyor belt would carry these supplies over the truck/car, and you would have to make sure that they land at the right spots, on truck-bed or trailer.
After you have few of the supplies, you would need to deliver them to different camps/bases, and some bases would be closer to the starting zone, and give less money per delivery, and some bases would be further and give more money per delivery, and you would have to delivery whatever supplies you picked, to the right camp. So one base would only accept particular type of supplies.
And in between your starting location and camps, there would be zombies ofcourse 
and probably you will be able to upgrade machine guns on truck, and so on.
With that money earned from deliveries, you would then go to upgrades screen, where you could upgrade every aspect of the cars and trucks. You could upgrade suspension, engine, transmission, tires, 4x4 Drive, shielding, frontal weapon, ranged weapons, fuel capacity, maybe even turbo, but im not a big fan of turbos.
I have yet to decide how you would unload supplies, maybe a crane, it has to be interesting.
i already have car handling and driving working 100%, now im working on upgrading mechanics.
game would be for iOS, android, and for unity webplayer.
it is profit sharing ofcourse. I attached picture of what im currently testing
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If you want to, I can do some comic-ish art. Unfortunately, my PC currently is broken (writing this from my tablet), but once it returns, I could start doing the art.
As it's a bit difficult for me to take money (I'm still a minor and the tax system is quite difficult in Germany), I'd suggest to publish the game on WIndows Phone (I've got a developer account there) - you can take all the money from iOS, Android and WebPlayer, and I can do the same with the windows phone version (though, because the taxes are so complicated, I'd just put an AdExchange-Control in there first). If you don't like sharing your source code (I guess your working on a mac and therefore can't compile for Windows Phone) or don't want me to publish it for another reason, feel free to suggest another way reward me:)