Several years ago, Eric and I were pulled over on I-70 about 40 miles east of Indy. We were driving a Ford dually and a tag trailer. Motor Carrier Enforcement asked us if we raced for money or trophies. Said that because we race for money, i.e., money is paid to us even if we spend WAY more than we take in, then you ARE commercial. Had to go to the next exit's truck stop and buy a few items, such as a set of reflective triangles, etc. By the way, we were pulled over because we had a tail light out.