Temperature should be fine by then and your camper should be fine also, it is a beautiful area
50 to 75. Illinois department of natural resources is the best place to find camping information.
Have not been there
It all depends on where you want to camp and how close you are to what you're interested in
Camp Cadiz will fit your rig if you are 30 foot long or less. Weather is warm 50s during the day, rainy. They are having much flooding currently (2/20/18) so I would find a campground outside the park and day trip in. The Landing Point in Cape Girardeau is great, clean and well appointed.
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