if it has say a 300 gallon water tank and its full you just added 2500 lbs to the gvw. with the ashton full of water(500 gal)and no equipment on it weighs in at 14100 lbs and is rated to 16000 with equipment added on. big difference in operation and stopping power from no water to full of water. rarely do i ever carry large amounts of water. what are the hills like in maine?