The first thing I did on any of my trailers, was to replace the ST's with LT's. I would try to match the tow vehicle, usually 235/85r16. Now though, I have 17's on the TV so on the Wildcat I'm running Maxxis LT's. I have never had a truck tire come apart unlike the "designed for trailer" tires.
*Current: 2005 Ford F350 Crew Cab Dually 6.0 diesel 4x4*
*Retired: 1987 F350 Crew Cab Dually 6.9 turbo diesel
2007 Forest River WildCat 32QBBS