Back the truck into the local Wal-Mart through the garden dept. There are less pipe / concrete ballards that would stop your vehicle from hitting the doors and that department is directly next to the pet department. It is also on the opposite side of the store from the grocery & clothing areas so there will likely less looters there.
At that point I would load up on the big bags of Old Roy dry food (cheap meat & fat protiens that don't go bad quickly) and any canned foods that might be around. Sice the sporting goods department is also right there about 5 isles up I would hit that place hard as well for any ammo, arrows, clothing & firearms that I could get my hands on (even if we had to go through a few folks). There can be no mercy beyond family at the point of a cultural meltdown.
Other foods (people food) could be aquired, killed, taken or grown as needed. Water & ammo aquisition would always be top priority.
Once the immediate BS has been set aside, my plans for securing village after village would go into effect.