Even Google's only option for what is meant by "Dulles" is an airport, so I'm at a loss. Are you asking if the wash will dull your waxy shine? If so, I'd say, "It's possible." But that depends on just how shiny it was when it started. If you're asking about the airport, I haven't a clue on how to respond to this question.
I'm pretty sure they can't. Seems pretty small. For a truck that size.
No the wash pulling device is not wide enough to accommodate 2 tires
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