Have an enclosed utility trailer preloaded with everything but individual family members personal effects. Then just hitch it up and go. Maybe put a logo on the side like, ‘Ace Sewer Cleaning’, or ‘Medical Waste Disposal Inc.’
I think too many people are expecting total WROL. A much more likely scenario will be too much ROL in the form of martial law as the primary threat, probably mixed with urban civil strife and crime. Governments tend not to simply evaporate overnight, especially one like the US government that has been prepping for this in a way no individual can. No prepper has anything like the preps of the US government. The US Federal Government is the ultimate prepper, and in a crisis it treats all local governments as a subset of itself.