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A 265/75/16 tire measures 31.6 inches tall and 10.4” wide
One issue is I don’t think a 15” rim is going to fit over your brake calipers , the second is if they are load index 109 that equates to 2271 pounds each tire and your rear axle GAWR is 5250 so you are giving up about 700 pounds in capacity.
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