I concur with Jenn on who much things can accumulate around the containers over the course of the event, as it sees the detritus of both offloading and on loading and people have traditionally camped in the shade of the trucks before the moop sweep at the end.
One other thing I noted from last year was the number of bicycles that were just put into the container rather than being properly broken down and packed tight. Everyone should take the responsibility to do that, cause as more random bits get tossed in like the that, the inefficiency of the packing will have things pilled back to the doors in no time.
Another note I would mention is that for smaller camps and individuals, loading their things was pretty straight forward to accomplish, while the bulk items for early arrival were mainly AutoSub, Steambath Project, Let's Fly a Bike, LoRes, and Blakes art car.
There hasn't been an effective breakdown for shares bought to load in sweat equity other than those with the biggest baggage trains tend to stay later and get the job done while the lighter loading is pretty turnkey and doesn't leave as much for people to do for the earlier part of the day once they have dropped their things off.
Ken