Another vote for Cherry Hill for visiting DC. The bus to DC picks you up in the campground. They have an orientation presentation at 4PM, I think. They cover the bus, getting to the train, night time bus tours and such. Wonderful place to stay.
2014 Phaeton 36gh
2008 Jeep Rubicon or 2012 Ford F150 4x4 Lariat towds
or a couple of different trailers
Retired in Apple Valley, California