For me it's based on where you are, where you think you'll be trying to get to, how many of you are going, and what you think you want to bring. I've got myself, my bride and three kids. Going to Grandma's house looks like an expedition to Everest; our ideal bug out vehicle would probably be a C-130. Sadly, my driveway isn't quite long enough to park one.

All jest aside I think my ideal BOV would be a crew cab 4x4 with an auxiliary fuel tank and a cap. What I've got is a mechanically reliable minivan and a lot of experience driving road vehicles in less than ideal conditions.