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My first thought is that you don't want your car to create lift, for two reasons, it takes energy to create lift! if you have a wing it will glide furthest if it's neutral, also lift is going to reduce traction, you already have the weight of the vehicle creating pressure on the tires to create traction, so in a strong side wind you'd have less traction and if you had to make a quick turn you'r vehicle would either have to drop down to get better traction or it would have to use wings like you were talking about to push on the air to move it in the direction that you wanted to go, either way creating less air drag seems like a better idea as air drag is a larger drag on the vehicle then rolling resistance from what I understand.
I've thought about building a vehicle who's tail bends with the turn it's making, but it'd only need to bend as much as the degree of the turn and at low speeds when you make sharp turns aerodynamics are not as important.
If you are willing to put that much work in to a vehicle, I think that building a wing like the wind powered cars have would be the way to go, harness the power of the wind around you.
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