Those really big truck campers should be on the bigger 550-5500 trucks. Bigger brakes too that way. I know my F250 is probably a little overloaded but not severely. I have the higher rated 3400 pound each load range E tires, heavy sway bars front and rear, Larger 5500-pound leaf springs in the rear and soon, 3 leaf heavier springs in the front, Firestone airbags which provide a third center support point to the frame directly above the axle and halfway between the front and rear shackles. No signs of frame stress at the usual break point between the bed and cab. I would really hate to have it do something to me when I'm on one of those middle of nowhere back roads like at Alamo Reservoir, AZ last year, (Alamo Rd.) when I sank into the deep road gravel. there were several bouncy parts to that road for which I'm glad nothing happened.