Thx for the reply!
I noticed that when I disable the service door, a smaller catering truck always appears which works for me

Concerning the fueltruck not fueling: I set the fuel quantity to around 2%, then whichever fuel quantity I select, none of them make the refueling work (both animation and the amount of fuel onboard). The fueling point is not underneath the wing but behind the wing, vertically mounted about 1,5 meter from te ground. Should any truck that appears play some kind of animation, or is this not yet implemented?
Also, I noticed that a lot of vehicles drive through the aircraft, wings, cockpit etc. Can this be resolved? I'm pretty the location of the engines and the anti-ice start and stop point on the wings are located where the should be in the aircraft editor (if this has anything to do with it). Am I missing something else?