Our ST25RB has 6 inch frame rails if i recall correctly. Best best to give Andersen a call and they can answer your questions for you about the right bracket.
Be sure to keep us updated on what you think of the hitch. There isn't a lot of real owner info out there on this hitch for those of us who are on the fence.
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Home is where the hookup is.
2012 ST25RB Reserve tailgating a 2011 Chev Silverado 2500HD Duramax
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