Looking around online, I see many references to blowouts and tread separation on the G159s. There is also a lawsuit that was just settled in 2010 from back in 2004 where a family as severely injured. Seems the G159s were never designed for RVs although Goodyear marketed them as such. They were originally designed for smaller trucks with lighter loads and a 65MPH rating. And apparently, instead of recalling the tires, Goodyear arbitrarily upped the speed rating on the G159s from 65mph to 75mph even though that would cause excessive heating and tread separation. Definitely not what you want on an RV. I've got them on all corners of my RV...thankfully only the two blew out and they were rears. Will be replacing with proper tires soon.
Wonder if there's any relief from Goodyear on the cost of replacing those tires? Sometimes there are so-called "silent recalls."