skaterboi:
If there's any doubt when I taxi my aircraft, I get wing walkers out to give me a thumbs up for good clearance. Same should apply here. There's simply no excuse for driving things into a parked aircraft.
Funny...reminds me of the time I watched a RAF C17 being 'wing-walked' into the tail of an EA6 at El Centro a few years back...sure the loadie had signalled the handling pilot to stop, but the oh so gentle application of brakes was too...oh so gentle!