Marathon tires by Goodyear

Well I was going to replace the Marathon tires when I had the extra money. I've had problems with them on 4 different Rv's before. Nothing but problems.
Well I made a quick trip into California, from Sedona AZ. and low and behold tire seperations. This is not new with them. I've had them bubble with 1500 miles and 2 months old. Most cases the Goodyear dealer did not stand behind the tire. Besides who cares? I don't want to be changing a tire beside the road, sweating like a hog and cars whizzing by. I bought Big O's trailer tire I hope I have better luck with them. Has anyone found a really good 14" tire?