The G159 is indeed designed for the regional/local delivery application and the pre-1998 version had a max 65 mph sustained speed rating. That was bumped to 75 in 1998, but it's not clear what GY did additional speed testing to validate that.
It appears GY may have tried to cover up the extent of the problems, but I get really irritated at the sensationalism in jalopnik.com and safetyreserach.net. In my opinion, statements like "The tire was designed for urban delivery vehicles" are intended more to make the manufacturer look bad rather than to help the public understand the issues. Motorhome use is classified as a subset of the "regional delivery" application across the entire Tire & Rubber Industry. nt just the G159. There are only two tires designed specifically for motohome use - the GY G670 and the Michelin XRV, and the XRV is also marketed for "regional delivery" trucking. Further, most medium and heavy duty tires available in the 90's had 65 mph speed ratings so GY was not pushing a tire that would be considered sub-standard at the time. And finally, it is the chassis and coach builders who selected the tire for their motorhomes, not Goodyear. Very likely GY Okayed that use, but they did not force any coach builder to use that tire. None of those factors get mentioned in the news articles.