I replaced my OEM ST235/80R16 Marathons with Good Year G614's which are LT235/85/R16, but load rating G vs the OEM E's. They were a perfect fit and fortunately for me my wheels are rated for 110psi max so no wheel change was required.
It was stated above that the LT235/85R16 is one inch taller than the ST235/80R16? I'm not sure where that came from, but Good Year's specs show both tires are 30.7" in diameter. I had absolutely zero problems changing to the G614's other than price, but you get what you pay for and peace of mind was worth the price to me.