Kuhn-thanks for the tire rotation procedure. My front tires are my newest ones, and I like to keep them fresh, so I like the idea of reversing your procedure. In other words-I'll mount some fresh tires on the left and right outer dual rims, then put those tires on the front. The old front tires then get moved to the inside duals on the same side. Finally the old left inside dual goes to the right outside dual and the old right inside dual goes to left outside dual. The old outer dual tires are then discarded.
OP - this technique would get your cupped tires off the truck sooner rather then later.
If I follow this procedure while replacing my front tires every two years my tires will get rotated out before they get too old and the front rubber will always be fresh.