Cargo doors for payload bay having internal payload extension and retraction mechanism

A system comprising:

• a rack for carrying a payload disposed in a payload bay of a vehicle;
• a rack extension assembly for affecting linear translation of the rack between a first position in which the rack is stowed within the payload bay and a second position in which the rack is supported outside the payload bay;
• a payload actuator system for selectively causing the rack extension assembly to move the rack between the first and second positions while the vehicle is in motion;
• a payload bay door in at least one of a port side of the vehicle and a starboard side of the vehicle;
• and
• a door actuator system for selectively opening and closing the payload bay door.