Where are the kids standing?
They are standing inside the trailer by the roll up doors. There is no ledge so it's just a drop to the pavement from the roll up doors. We back up to the door and stand at the bottom of the trailer and lift the air into the roll up door of the trailer with a gap of about 2 feet between the rear bumper of the PC and the side of the trailer. If a PC is hit and rolls and you are on not in the PC, you will be pinned against the trailer. A simple platform at the bottom of each door that is the height of the bottom of the air trailer would prevent any accident because you would just back up and touch the platform.