I remember those massive multi-floor hotels around Crystal City, and Northern Virginia is very large so there are tons of traditional highway-oriented chain hotels there.
Any status on whether MARC or VRE trains will be running? Certainly D.C. government liberals have no power over them, right? There are other options besides WMATA, especially Amtrak.
Not even just the frostbite and food concerns, I wouldn't recommend anyone sleep on the streets of D.C. with Antifa/BLM likely roaming at night. Whether in a car or tent or whatever. Especially if you can afford to avoid taking that kind of risk. There's no telling what shit they might pull if they find a Trump supporter sleeping in their vehicle.
Getting a place where you have at least a couple walls and security separating you from the lefty thugs seems pretty sensible to me.
Trump supporters shouldn't be out there on their own. If they start anything, there should be at least 5-10 of you to fight back.