You were parked in a parking lot with door open loading groceries and the truck next to you pulled forward to get out of its space with no car in front of it and it hit your door. Who is at fault?

Unfortunately, parking lots are not covered under municipal or state traffic laws. As such, unless there are definite witnesses or other obvious evidence, insurance companies will tend at assume that no one is At Fault in the accident and each individual will claim their own damages.