If they are Goodyear Marathons (have those telling words "Made in China" on the sidewall), I would strongly recommend replacing them with G614's or a similar type tire. Our previous 3750FL came from the factory with the Marathon's and our dealer was aware that the rig would not leave the dealership with the Marathon's on them. Replaced them with G614's which never had a single problem in the three years until we traded the 3750. I personally would not consider LT's since I do not believe they will be sufficient for a rig of your weight.
Bingo
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Bingo and Cathy - Our adventures begin in the hills of WV. We are blessed by our 2014 3850FL Big Sky (previous 2011 3750FL and 2007 3400RL) that we pull with a 2007 Chevy Silverado Classic DRW CC dually.
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