275/60r20

I am looking for LT tires in the 275/60R20 for towing my travel trailer but the best I was able to find so far are Michelin LTX M/S2 and Cooper Zeon LTZ They are both P tires still but probably better than the Goodyear HP on the truck right now. I am not against going down to 17 or 18 but not...