The KOA in Ohio is at Bluffton but it is not a good choice unless you are stuck for a place to stay. Expect electricity only. The last time we tried to use it the sites that might have had water available were already taken by permanent people, there was no other water available anywhere, the WIFI was not working, and we could not even find the dump station due to the amount of snow on it.
Personally I would try for Kentucky Horse Park the first night. It has electricity all year round so you can run an electric heater to augment your propane and you won't have to worry about your batteries. The store is usually open although on limited hours, their washrooms and showers are open, large, clean, and heated, and WIFI is available. Water is available at the dump station but not at the sites. If the weather turns nasty and you have to hole up for a day or two it is not a bad place to sit out the storm. We leave the Hamilton area around 6:00 am, go via Windsor/Detroit and usually arrive at the Horse Park around 5:00 pm.
If you stop at the Horse Park make sure you check the weather for the next day. You still have the highest part of the trip ahead of you which is the first 15 miles or so as soon as you get into Tennessee. That is where you will have the biggest chance of some nasty driving.
One other note. We just got back from our Fall trip where we take the trailer down, store it for a few weeks, come home for Christmas, then go back down in January. Expect some single lane construction on the 401 near Chatham and a fair bit of construction on I-75 in Ohio. The Ohio bit is 60 MPH for the most part but narrow lanes and it goes for bout 30 miles from just south of Toledo to Findlay. If that makes you nervous you can get around it by taking I-280 from Toledo to where it ends, follow 23 to Fostoria, then 12 back over to Findlay. A bit of a long way around but it avoids the narrow lane section of I-75. Also, due to the ongoing construction I would take the I-275 east bypass around Cincinnati.
