IMO the lower tow weight of 13,900 would be about max. You need to weigh the truck loaded to camp, gear, people, full fuel, anything going in the truck. Now get separate axle weights, most all pin wt goes on rear axle. If rear axle weighs 3,200 on scale, and RAWR is 6,200, you can only add 3K more to the rear axle. If you don't have a hitch installed most are about 200 lbs right over the axle. If needed suspension support can be added, such as air bags, or Timbrins. You cannot go over the max tire rating!
Jerry
