Thomas Rhett’s current single, “Marry Me,” is motoring its way up the charts. Currently, it is No. 6 on Billboard’s Country Airplay chart as it looks to follow in the footsteps of his previous No. 1 single, “Unforgettable.” However, unlike “Unforgettable,” TR’s new ditty is non-autobiographical. TR says the twisting tune, which he co-penned with…