For sheer bugout convenience in such a scenario, I would think it far more preferable to have a sturdy on-road/off-road motorcycle, something akin to what Ewan MacGregor used to circuit the globe with. A motorcyle like that can go places 4 wheel vehicles cannot, including the median or the shoulder, or cross country. You don't have the luxury of equipping like you would with a pickup or SUV, but if the objective is to get the heck out of Dodge, then having more gear with you is pretty insignificant if you can't get out. Plus, solicitations for rides are going to be a lot less likely.

Personally, I rather like the BMW R 1200 GS Adventure package. It fits me, and with 105 hp on two wheels, you can get out of Dodge quick, at least till you hit the deer.