ANSWERS: 1
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Pretty hard. Car suspensions normally move up and down and replacing the shocks with hydraulics/gas-bags does not change this fact. That means that you can make a car "dance" and "hop" relatively easilly. Getting the wheels to move forward and backwards would require a total replacement of the entire suspension, and most likely would run into problems including but not limited to the tires hitting the front/rear of the wheel well or the suspension being unable to hold the suspension in a proper position to actually drive, especially at speed, thus rendering the car strictly tow-and-show.
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