We just returned from our first trip with Goodyear endurance tires on our camper. They seem pretty nice. I did have to get up to 80+ to pass somebody, and felt better about doing that with these tires than the oem china tires that used to be on it.They were supposedly E rated, and you're right about the 65mph limit. The Goodyears are also E rated, but have a 87mph limit, which I'll never be reaching, but should be a much better constructed tire.