My 2016 Chevy 1500 4x4 doublecab weighs in at 5680 with me in it. My 1979 Grandby that I rebuilt with no heater, no propane, 1 battery, electric jacks, and a compressor fridge rang up 6780 on the scale. All my plywood was 5/8 and less. I'm guessing your 2 batteries propane, heater ect. adds up...