Actually if you are working in DC, other than Bolling AFB, parking will be an issue. You will probably be on the Metro which is not all that bad.
We usualy have a couple of meet and greets in the MD area every year including one in the winter.
I have a street Tacoma so I really do not know about off roading. I do know that members in PA go off roading two or three times a year and usually a few DC members show up.
I hope you enjoy DC, my home city. There is a lot to do at no cost to you. Seems like there is always something going on down at the Mall every weekens all year long.