I see advantages and disadvantages of each. Some states where we get snow/ice/rain I don't think I would want to try bugging out on a bike, probably wouldn't get very far, but on the other hand you could run that bike along the berm in a traffic jam. It goes to show there is not one perfect vehicle for every situation.
The best idea I have is to scale down your gear as much as possibe, choose the smallest and lightest you can so you can fit as much as you can in/on whatever vehicle you have.