i would think at least 30 acres would be needed. that way you could get a few trucks on there at a time, and offer alot of different obsticles. 1 acre has 43,560 square feet, to give you an idea. we own 2 1/2 acres at our place, and it looks big. but if you figure in turns, and hills, and some land scaping, it would look tiny.but great idea. also you might need a pretty hefty fence around it, so people couldnt get in there during closed hours.
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