If society falls apart unless you have a tank and a LOT of fuel you can’t go anywhere. You have to figure on defending your home fortress. You probably can’t do it by yourself. You have to organize now for family and neighbors to come together to keep unauthorized people out of the neighborhood. You have to have big firepower to make the moochers that want your stuff decide it is easier to take it from somebody else who won’t kill them.
Realize that your windows will be shot out and that anything not nailed down will walk away if there is not a 24 hour guard.
I hope this is all nonsense but it could happen.
I already have a plan in place where each 'squad' member has sufficient armament and ordnance and communications to stand a 4 hour watch on a rotating basis. And I don't live anywhere near a big city.
The only challenge will be assembling the squad at this rally point when the SHTF. We are geographically dispersed. Each has a BOB and a route planned off the highways. But it will be a challenge if the stuff gets more than ankle deep.