Your trailer is probably not that heavy. It's a 16 foot trailer correct?
What size are your wheels? 13 or 14 inch.
Most of the problems I have read about ST tires blowing are on heavy trailers. ST's are generally cheap compared to LT's, so for a light trailer, with smaller wheels, I would go ST's. Just do some research on this site and other RV forums and try to find the best ST's you can get to fit.
2013 F350 6.7 DRW SC Lariat
2011 Brookstone 354TS
Swivelwheel 58DW w/1993 GL1500SE