Running Cooper Discoverer AT3 285/70/17 in P metric. FWIW none of the tire shops near me could get these in P metric and only a couple could bring in LT versions. I bought my set through TreadDepot.com and had my local shop install and balance them.
have you looked at the p metric 285 nitto terra's and toyo open country at2's?
Cooper is still making the tires. A friend of mine who owns over 20 tire retailers said that Cooper does not have the manufacturing capacity for a popular tire like the AT3. He has had them on back order at several stores and routinely moves them from store to store to meet demand.