I have ST plates for both my boat trailer, and my 5x10 utility trailer....got them last year, and the lady at the DMV told me the state just probably hasn't figured out all the money they are losing. She said this may last a month, or may last a couple years, but with as corrupt and money-hungry Illinois is, don't expect it to last but a couple more years. She then assured me that those who have the ST tags will be "grandfathered in" if anything changes. SO, I told my dad, who the day before just went and renewed his registration for his boat trailer for the $118. So, he went back and asked his DMV about the ST tags, went ahead and bought it, and he should never have to worry about it again. He got his renewal in the mail the other day for the regular one....threw it in the trash!