Forget his wagon wheel — Darius Rucker spent his day behind bars. The country singer, 57, was arrested on a minor drug offense on Thursday, RadarOnline.comhas learned. Rucker was taken into custody in Williamson County, Tennessee, around 10 AM. He was booked on three separate charges, which are all misdemeanors. The Hootie & the Blowfish singer was arrested for two counts of simple possession/casual exchange of a controlled substance and one count of violation of the state’s vehicle registration law, reported TMZ. The outlet also stated that police believe he had expired tags on his vehicle; h…