D4 is a hoot! My S3 did something similar, came waltzing into the living room in his b'day suit.
Sue, forgive me for asking, but if the van really is your van, why does H think he can just drive it any time he pleases? With his DUI problem isn't he at risk for putting your means of transportation at jeopardy?
And if/when you move out and are separated, does he still think he is entitled to free access to whatever vehicle you have?