it takes HORSEPOWER to create aero lift so you would be replacing a small- really small- amount of rolling resistance with a large amount of lift induced drag and not only that, the handling characteristics would be so peculiar and unpredictable that this thing would be a death trap. People can barely handle controlling a vehicle in two dimensions, let alone three. The one thing I could see as having at least a shred of utility is aero assisted braking, but if one isn't driving like a doof hard braking is generally not needed and we're not going fast enough for it to really work anyway.
Try lining up a small airplane with a runway in a vicious crosswind, or taxiing, taking off, and landing and you'll see how interesting things get when a vehicle has light contact with the ground.
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