LT vs ST - replacing Marathons

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I wonder if anyone can recommend any LT tires for my '07 20' Safari. From what I have gathered here on the forums and talking with Airstream, the ST tires are made for more sitting, while the LT tires can handle more driving, higher heat and perhaps faster speeds and heavier loads. BOTH of the original Marathons on my trailer have blown, causing significant body damage. The first one blew after just a year. It blew out in Arizona when it was over 100 degrees. It was probably our 4th day of long driving in hot weather. The other tire blew a year later, again after long days of driving in hot weather. Now that I need a new set, I am thinking that a load range E Light Truck tire might be better suited for my traveling needs. Any suggestions? Thanks.