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My truck has all the safety equipment required by the Transportation Safety Act, and even some extras, but it's not the place of a show organizer to tell me what I need and don't need.
You will not be able to park on the field at a a USA ATHS national show unless you have a fire extinguisher. The ATHS local shows are supposed to have the same RULE but they are often a little lax. They do not tell you where/how it has to be stored/attached.

Oh, they have a right to make any rules for a private show. Get over it.

Some shows require a wheel chock, or provide one. This is odd, your truck could roll in either of two directions. Why not require two wheel chocks.

An explanation would be appreciated. An argument will be ignored.