Live in the area an use the tunnel often. Two axle coach with a CRV will run you $31 in tolls. Keep the CRV connected. Will actually cost you a few dollars more to disconnect and drive separately. EZ Pass will pay it if you have one in the coach. Be sure to remove the EZ Pass in the CRV and wrap in foil or you could be double charged. Use the far right lane as mentioned as they will ask about propane. Never had them verify, yet.
When you head out of Norfolk towards Williamsburg on I64 the Hampton Roads Bridge Tunnel also has an inspection stop before the bridge and they will verify the valve is closed. Miss the inspection and they will stop all traffic and pull you out to inspect. Same with I664 if you choose to loop around Norfolk.
Much better drive down US13 than heading east on US50 thru Annapolis which is your alternative. South on US301 out of Annapolis has a toll bridge over the Potomac River. One lane in each direction for about 2 miles. Much worse than the two tunnels.