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I agree with Glenn, but would like to add a bit to it.
My trailer has ST235/80R16 LR E Mission tires on it now, with a load rating of 3520 lbs. at 80 psi. The outside diameter calculates to 30.8 inches. The LT245/75R16 LR E has a load rating of 3042lbs. at 80 psi., with a diameter that calculates to 30.47 inches. The LT235/85R16 LR E has a load rating of 3042 lbs. at 80 psi., with a diameter that calculates to 31.73 inches.
Given this information, and my own personal experiences, I still trust the LT tires with the lower load rating, over the ST with the higher load rating. I have no reservations about putting the LT's on my trailer, but you will have to do what you feel comfortable with. I also only carry 72 psi. in the Mission tires, not 80.
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