Pop -up camper is lifted with 31 X10.50 15 tires which fit my truck and is fully off road capable. I've 4 wheeled that trailer places I wasn't sure I could take it until I got there. Things kinda get rattled around when you do that, but things are secured pretty well. Obviously alternate routes are part of our disaster plan. Fortunately there are plenty of old mining and back roads that converge at different points. I know a lot of folks don't have that luxury, that's one reason I left the city.

When you are trying to get several million people out of a congested area you'll have problems with traffic.