I know the above is extreme, and it might be possible to get a parking spot a little later, but there will be millions of visitors with the same idea as you, and the parking spots will go very, very quickly. Tune your car radio to WTOP 103.5FM when you get to Front Royal for regular traffic updates.
By the way, if you have a smaller vehicle than the truck, take that instead--it will be easier to find a parking spot with a smaller vehicle.
Be aware that getting back on Metro will be an even bigger challenge--it_s expected that Metro, even running every piece of equipment they have, will take many hours to get everyone out of DC back to where they started. Also expect a coldish day, with temperatures in the low 30s.
Here_s a link to the Metro website, which will show you how to get around on Metro:
http://www.wmata.com
And yes I know where Staunton is--it_s a beautiful town with a lot to see and do. I_ve seen plays in the theater and eaten at the Depot Grille.
http://www.wmata.com
http://www.arlingtonva.us/Portals/Topics��
I-66
EAST (Inbound, toward DC) �C CLOSED to all privately owned vehicles; buses, shuttles, taxis allowed
WEST (Outbound) �C OPEN to all traffic
All access ramps within Arlington to I-66 East �C CLOSED (hard closures)
Glebe Rd. and Sycamore St.
I-66 West �C Key Bridge/Lee Highway Exit �C CLOSED (hard closures)
Route 50/Arlington Blvd.
EAST (Inbound, toward DC) at Washington Blvd. �C CLOSED to all privately owned vehicles; buses, shuttles, taxis allowed
WEST (Outbound) �C OPEN to all traffic
All access ramps to 50 EAST inside Washington Blvd. �C CLOSED (hard closures)
I-395
NORTH (Inbound, toward DC) �C CLOSED to all privately owned vehicles; buses, shuttles, taxis allowed
SOUTH (Outbound) �C OPEN to all traffic
All access ramps within Arlington to I-395 North �C CLOSED (hard closures)
All access ramps within Arlington to I-395 South �C OPEN
Shirlington Circle �C CLOSED to all privately owned vehicles; buses, shuttles, taxis allowed
Nah, that isn_t enough.. catapult.