An aircraft refuelling tanker with towable Ground Power Unit (GPU).

AG1 = Truck Engine On/Off
AG2 = Lights
AG3 = Left Indicator
AG4 = Right Indicator
AG5 = Trailer Hook-up (Activate, wait, then reverse slowly to pick up the trailer, be careful of speed during towing)
AG6 = Start/Stop GPU Control.
VTOL = Truck
Roll = Steering
Brake = Braking

Trim = GPU power

The truck is driven with VTOL for forward/reverse movement and roll for steering, use brake to brake.

The GPU is operated from AG6 with a Trim UP to adjust GPU power setting (no actual action other than sound).

Notes:
The truck drive shafts spin once VTOL is active and they move with the suspension.
The steering wheel moves, brake lights activate during braking, the GPU lights activate during operation and the control door opens.
It also has protective flares.

Not a lot else too it!