NJ - Fredericksburg, VA - Richmond Hill, GA - Nashville, TN

The tunnels around Baltimore have propane restrictions. You need to take the I-695 beltway either East or West. East is shorter, but has a toll on the Key Bridge. West has no toll, no bridge.

Another route that will avoid the I-95 tolls in DE and MD and all of the Baltimore/Washington area is to take DE-896 to US-301 South to US-17 to Fredricksburg.