Anything on four wheels basically depends on road travel. Even 4X4s get canalized by canyons and rivers into narrow passes and bridges, which will be gridlocked, or ambushed.
If you can’t do the motion of the ocean, I’d look at houseboats. They can cover the entire SE from TX to MD, and hide out in vast estuarial systems far from cities, highways and roads. If you can figure out an RV, you can figure out a houseboat, and they are dirt cheap in rough cosmetic but functional shape.
I’ve seen some programs on extreme RV vehicles, pretty rugged, not as likely to have a problem for folks on houseboats,, what with never knowing if global varming may shrink reservoirs and inlets or freeze them out of options as we get hit by a mini-ice age.
Not cheap, either way, maybe just living in the mountains near a stream is the way to go,, ‘til EPA says its a no burn day..
I appreciate the elements of adventures that may happen on land tho too. :-)
IMO going to sea is an option but not for everyone. First of all you can’t store as much on a boat and are vulnerable to others on the water. Its likely there will be pirates.
Still I live within 10 miles of several marinas. One of my plan B’s is to go find an abandoned boat and take my chances elsewhere.