from the amount of time and energy it must have taken to do that and the fact they left items of value i would guess they were, in their own weird way, almost having fun with it. if you park at the airport often perhaps they know your vehicle.
with all the work involved to hack up your jeep looks like it would be easier for them to just get a job like the rest of us. to bad you can't mount one of their heads on your hood. might be a good deterent.
sorry for the loss
scott