Absolutely agreed, our door is closed all the time whenever the aircraft is moved, and we would never use a device like this to move it. I just thought that it was pretty cool, I do however know of people that do not mind leaving the door open, and I can not imagine that if the door bumps into something the aircraft will never be able to pressurize again.Not being dramatic, seen it happen at a Signature. They never could fix the problem after it happened. If you prefer to leave the door open. Go right ahead.
Simply put, shutting the door prior to tugging could avoid a big head ache.
That is all.
Its really not made for use to pull a plane long distances. Just inside the hangar and outside the hangar in the immediate area for positioning and parking. The m120h model which me might get for our Learjets is 1,150 pounds, so it has a nice weight to it to be planted into the ground. The tug used at our FBO weighs 1,250 pounds. It also comes to a stop at a rate that coincides with its speed, so it never just stops suddenly, which is what would cause it to start planing across wet ground. I had the same question: "Wet ground, going down a slight slope, at full weight, and having to stop suddenly." It won't slide the way they have it set up and how it slows to a stop. It takes about 3-5 feet to stop from a full speed pull. If you're moving it around the hangar, obvisouly very slowly, it will stop much faster, like instantly.The visual of a fueled Global or Gulfstream pushing that "toy" off the ramp and into the woods has me chuckling...