Checking in from the Junction City area.
You have a few options:
1. Tuttle Creek ORV - Randolph, KS (north of Manhattan)
2. KS Rock Park - Near Fort Scott (cost a little to get in, it is privately owned)
3. Clayton, OK (Never been)
I would say those are less than 3/4 hours from you. I absolutely love wheeling at Tuttle. Trails for all sorts. Mud, rocks, hills, ledges, etc. Living 35 minutes away from the park has spoiled me, thus I am very familiar with the trails and how their conditions change with the weather.
If you ever want to come this way, let me know! I am currently rebuilding my rear drive shaft, so I will be out of commission for a little bit.