I live in NE Ohio. You are right to watch for rust. ALL steel trailers in this climate rust. That's why I bought aluminum. They cost more up front, but they hold their value. Used ones are still 75% of new price, even when they are old, so the money isn't gone. I love my 4 star all aluminum.
Now if you have a giant building to park it in during snow, rain, (most of ohio days), then you might be ok with steel.
The Hawk steel was my choice of steel ones, but the 4 star all aluminum was about the same price. Just not fancy.
I do wish I had wooden floor boards but they would have to watched closely in this climate too. If you keep them oiled with boiled linseed oil, they last longer.