would need a fair wack of space, I know of a few areas that are around 10acres but the majority of it is surrounded by horse properties and is sandy. (I ride the area on my CR)

Even if you had off road tires on, after about 4-5 cars on a circuit it would be as soft as the beach..

Harder than it sounds I think, unless you are keen for gravel/bauxite runs..(I'm not)

but a nice grass track could be fun

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K.E.R.S!!!1