Tire separating after 200 miles , Power King Towmaster

I replaced mine with B.F.Goodrich Commercial TAs in the 235X85X16 LT Load range E size. They are about 1" closer together but my X Chocks fit just fine. No tire problems in over 10,000 miles towing at whatever speed I want not just under 65mph like ST tires require. My loaded axle weight is in the 8800# range so I have plenty of capacity. I'd do this again in a heartbeat. If it was me I'd reconsider those Goodyear Marathons. They're just another junk Chinese made tire with an American name..Don

I have the powerking tires on the northtrail 31bdss. The size is 225/75-15 LRD. As i read today, they don't sound very good. I decided to look at tires on the farm. On our honeybee headers, one has goodyear marathons( made in Canada), the other has titans which I think are US built but I couldn't find it any where on the tire. Both are LRC