I live in Indiana and there is a great offroad park in Eastern IN.
a town called Laural IN. check it out at www.haspinacres.com
they have all kinds of trails from easy dirt roads to very difficult mud pits or hills pretty much whatever your looking for. I have to drive 2hrs East to get there and it is well worth it it is 15.00 per person per day and you can even camp for no additional charge.