Originally Posted by ependydad
Often times LT tires have less carrying capacity than equivalent ST tires. Which means, you could end up unknowingly be overloading the LT tires.
I'll echo what ependydad said. As a rule, ST tires have a higher load capability than the same size LT.
My setup is a good example. My Chaparral has the ST235 80 16 E on it. The side wall says @80 psi- Max load is 3520. I have the Firestone Transforce HT tires on my truck. The size you are looking at, LT235 85 16 E is rated with a Max load of 3042. Link
That's nearly 1000 lbs difference. My 5er weighs 12,500 before I put anything in it. The GVWR is 14,500. If I load it up, the pin weight is about 2400 lbs. If I do the math right, that still leaves over 12,000 on the trailer axles. The LT tire would be completely maxed out. (3042 X 4= 12,168) I'm not comfortable with that.
I completely agree the recent Marathons are garbage, but I would still go with an ST over an LT unless the LT was a F or G load range. But then you'll need to check your wheels to make sure they can handle the additional air pressure.