KC-46 has 18 pallet position, dual row. The fuselage contours at about 36" inches, so you're limited to the size of each pallet in the dual row config. When carrying seat pallets and the ATGL, cargo capacity is obviously even more limited. KC-46 is not designed to be the biggest, fastest, most capable cargo hauler, pax carrier, refueler, but it does all of those things "okay".