A doctor friend mentioned that they had to deal with a patient weighing an estimated 55 stone. Six fire brigade guys to lift said patient into the hospital after removing the front doors and handrails. They couldn't weigh the patient because they were just too heavy for any scales that the hospital had. I suggested a commercial vehicle weighbridge to weigh the ambulance, with full fuel, with and without the patient... 350kg. I've flown aircraft that weigh less than that. A good weight for a pit pony...