Interesting comments you made there suitcase,
1)How does one over pressurize the fuel tanks??? Thought there was this thing called vents....
2)How can he defuel?? Does he go into your flight deck unnoticed and flips boost pumps on, raises a start lever, open the fuel dump panel,etc,etc??
3)Loads contaminated fuel? Ok suppose could happen...
4)Drives the truck into the aircraft or allows it to roll. Well I guess he could manage to park it in to your airplane, but please explain how you roll the truck..
5)Drives off without disconnecting the hose? Have you ever supervised the refueling of your airplane?Obviously not....cause you are, maintenance are to make sure he doesn't.
6)Has a smoke during refueling?Where in his truck under the wing while you're supervising him?
7)Loads 5000Kg instead of 500Kg's?? Errm he doesn't fuel Kilo's but liters and it's your responsibility to ensure the correct uplift was taken.
8)I'm sure most of us know how to earth an aircraft. True, I take that back, should have read:suitcase man doesn't know how to earth his aircraft.