Basically you have three choices. One is to stick with ST tires and use the ST235/85R16F rated at 3960# at 95 psi or use the LT trailer tire LT235/85R16G rated at 3750# at 110 psi. or move up to the 17.5" medium truck tire for low platform trailer service sized 215/75R17.5H rated at 4805# at 125 psi.
http://simpletire.com/gladiator-235-...42003865-tires
CW