As most Heartland products in the 16,000 lb. GVWR will have a wheel position weighing in the 3,600 lb. plus range, to generate a 20% reserve load capacity you need to air the tire to carry at least 4,320 lbs.
@ 110 psi the load capacity is 4,340 lbs.
@ 115 psi the load capacity is 4,495 lbs...