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"Even the most gently graded driveway would defeat it."
I used to drive a tow truck and we had the same problem but for a different reason. If you drive up a steep grade in a tow truck while towing a car, the back of the tow truck drops and there is a risk that the car on the back will hit the road and fall off. (don't ask me how I know this) The solution is to approach any grade on an angle. Now for a speed bump this would be difficult, but where you are going into a parking lot that has a steep grade, try to go in at an angle, so only one wheel hits first.
I hope that makes sense?
Peter
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