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Knowing you VP my suggestions won't be anything you haven't already thought of.
Keep one hand free.
Extend your scanning zone by at least 10 yards.
Get everything in your vehicle first and then secure everything after you are in the car with doors locked. You can actually practice exiting and entering your vehicle with your child, packages, stroller, etc until you have a good smooth quick routine.
Travel/shop with another person whenever possible.
Be prepared to use your vehicle as a weapon.