Quality US made Goodyear G614's the issues just keep on coming, as well as the Endurance , blowouts ,plus wear issues . Great tire for the weekend warrior or light trailers ,not a good application for the heavier fifth wheels, just don't meet the weight ratings nor do they last.
How much more simple can we say it, the Goodyear tires do not have a capable rating for the bigger fifth wheels, Big reason you are seeing Westlakes , Sailuns etc. on bigger fifth wheels, that's a fact.
Montana used to offer the G614's , no longer.