Monty,
We only tent camped about 3 decades ago in our past lives ( we were both previously married then but all went camping together
) but there are a few here that list Rv sites. Here is a screen shot.
Take note that getting into and out of DC as well as parking will be a saga you can tell your grand kids about...and then they can pass it down through generations.... Been there for the bicentennial.....never went back. Now, we watch them on TV!
Now, Have a great time! :biggrin: