Was returning from the race in Indy today, and almost home when I was running low on Diesel. I have a 50 ft fifth wheel trailer so getting into stations is not always possible if it is not a truck stop. Got off 275 at 8 mile in Novi. I needed to drop the trailer in the Meijer parking lot to fuel. After unhooking and before starting for the station ( maybe 150 ft away) an Empty tractor pulled up behind my Rig. I made sure to make eye contact with him as I went by and never took my eyes of of him. Sure enough as soon as I went back and started to hook up he pulled out and left.