I've got Wardens on my Amigo. I think they just hit 12,000 miles in 2 years. My spare is on the back and open to the elements for two years. The spare has small, but noticeable, cracks around the edge even though the tire has never been on the pavement before. I can snap a picture if someone wants. I'd be comfortable with it getting me off a mountain though. I've had the tires up to probably 85 mph, but hardly ever drive that fast in any of my cars anymore. My rear two tires have the Kedge Grip. I still haven't rotated them.