Why not avoid direct-engagement until they're just about to figure out that you can hide in buildings? Anyways--I'd say engage a few front-line units and send them to the back to the engineering unit. When they're about to arrive, destroy the engineers.
Make them waste time and then slaughter the returning tanks.
Anyways--with the donkeys--how much damage can they do?
The problem is, the Americans have a mission to accomplish. We weren't just put on the board and told "kill each other". I don't know their objective, but I think it has something to do with the crops in the valley, in which I have a few tanks hiding, a truck, a ZPU, and 5 RPGs.
And the donkeys; I'm really not sure how much damage they can do. I'm using them more as a distraction. I mean, what would you do if randomly you saw an epic donkey charge? If they ignore the donkeys and keep moving, eventually the donkeys will catch up and kill them when they're fighting our main forces. If the see them then, then our main forces will kill them while they're killing the charging donkeys.
I think one of the best things you could do right now, that is, after taking out the Strykers, is to take out the US CAS and recon forces, because information is their only advantage at this point[that we know of]. Should also send one little ingsignificant unit down the side of the map they're ignoring so you can see what they've got cookin. btw, I wish I had that class 
The thing is, once we take out the strykers, we've won. They're a stryker company; everything they have is in strykers: their artillery, their engineers, their infantry, their big guns, their commanders. We need to know which strykers to take out. We take out the right ones, we cripple their leadership and maybe we'll kill their air operater and prevent more CAS runs.