I placed my truck in Park, exited the vehicle to assist my daughter to the truck. As we approached the front of the truck - the truck started Rolling forward. I tried to enter the driver side door to stop the vehicle but realized my truck was going to collide with the vehicle next to it and I tried to clear my body of the two vehicles. I was caught between the two vehicles near the rear driver side fender and couldn't free myself. My daughter entered the truck from the passenger side and the truck had went from Park to Drive. My daughter put the truck in Park and somehow I was able to free myself. I received injuries to my hip and pelvic area. The entire incident was recorded on a home surveillance system.