Our 27', 7,000 lb. Airstream trailer came equipped with the 15" Goodyear Marathons.  Since we purchased it new, we have put over 35,000 miles on it with two trips to Ohio, and a trans-Canadian trip.  They are approaching 4 years old now.  We have run them in freezing weather with rain and snow.  We have run them in the blistering heat of the summer desert.  Never have we overloaded them.  And never have we had a flat tire.   It's my understanding that it is not good for a tire to be skidded around like we do sometimes when sharply turning our trailers into tight camping spaces.  I also have heard that when we block the wheels to attain a level position, we should make sure that the tire is squarely on the block and not hanging off either on the side, front or rear.  These conditions all potentially damaging to the sidewall casings.  As has been posted several times in these threads, some customers overload their tires.  This is especially true with the toyhaulers and cargo box trailers.  It's easy to do, especially if your trailer manufacturer puts on the wrong combination or insufficient axles to handle the load.   If you could be making these mistakes, don't immediately blame the tires.   Also, since we belong to an Airstream Club, I see Marathons that have several different origins of manufacture on these tires.  Some are from China, some from Canada and others elsewhere.  Ours were manufactured in Canada.  I'm curious of the origins of the failed tires posted here on this website.   I highly recommend consumers use tire pressure monitors.  We use the Doran 360 RV.  These monitors can save you thousands of dollars in trailer repairs if you have a flat and don't notice it until it's too late.  If you have a slow leak, you won't notice it driving down the road.  You can't usually feel a trailer tire that's flat.  You can also have a faster flat from a puncture.  You won't necessarily notice that either.  If you run you trailer with a low pressure tire, it will heat up and eventually be destroyed.  The driver finally notices it or  another driver points it out and of course the tire is ruined and possibly so is part of your trailer, not to mention, your trip.   I hope some of this information helps.   gary

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