My understanding is that it does not matter if the driver is being paid or not, commercial status is dependent on if the vehicle is being use for commerce. If you are pulling a race car that has sponsors, or can be determined in any way to be anything but a hobby you will probably fall under the commercial DOT rules. If so then you are subject to weigh stations, commercial insurance, Commercial drivers license, etc. The list of requirements gets even more extensive if you are going to cross state lines. The DOT is going to look hard at any Toter, Motor-home, or Tractor pulling anything other than a obvious RV unit. There are several folks on this site that pull racing cars around, and they may be able to share some more insight.
Dave
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