I've
1. towed
2. fueled
3. washed
4. oiled
5. drained shi$%ers
6. serviced hydraulics
7. changed brakes
8. changed tires
9. loaded and unloaded
10. preflighted and done inspections
All has been a great learning experience. i have alot of respect for planes, I also have alot of respect for the people who have to service them.