As far as I know, GSX doesn't have a bulk cargo loader setup at the present time. There is a main deck cargo loader for freighter aircraft. If I had to guess, I'm guessing since this particular aircraft doesn't use the main deck cargo loader, they decided to use it as a bulk cargo loader. Great idea in theory, but not what it was designed for, and the result is you end up with stuff like this. Main deck cargo doors are generally on the left side of the plane, so interference with the vehicles wouldn't be an issue there. But if somebody uses the main deck cargo for the bulk cargo, now you're just venturing into uncharted territory trying to do things it wasn't designed to do in the first place.