Great solution! Convenient to Metro and DC. Hopefully, the timing will work. Posting a link to the specific post as original poster may not be familiar with possible locations.
https://sprinter-source.com/forum/showthread.php?t=54909
Peter is the administrator of the Westfalia (campervan) James Cook Friends Forum.
http://forum.james-cook-freunde.de/
And has transported his NCV3 James Cook from Germany for touring around the USA (that NCV3 James Cook version is not available in USA) and meeting various Westy folks. I think this is his third Westfalia tour around the US in the last few years.
HKPierce is the wonderful source of much advice on Sprinters, and many Sprinter write-ups, including all the important maintenance. I keep a paper copy of his maintenance write-ups in my T1N Westy (oil change, fuel filter change, etc.).