I've ran GY Marathons on my last two trailers and so far have had zero problems. I put 10,000 on the 1st set on our TT and now have over 6000 on the 2nd set on the 5'er. If the same tire is blowing then you have axle problems. The chances of a 3 tires blowing on the same wheel because the tires are bad is slim to none. My guess is no matter what brand tire you used on that wheel it will still blow. Maybe you have a brake dragging, bad axle or bad bearing causing extra stress on that tire. I'd take it to one of the big rig wheel alignment places and have things checked out.