Hi from a fellow Titanium owner! We have the same rig as you.
We liked Lake of the Ozarks State Park in Missouri. We chose to stay in the upper campground because of the narrow, winding road to the sites by the lake. I posted about our stay
hereWe did not camp at Petit Jean State Park in Arkansas but it is a beautiful park. There is a steep, winding road to get there but would be doable for you. I posted about it
hereWe've spent time in both Missouri and Arkansas. There are some beautiful places in both states. In addition to the Ozarks we also enjoyed being by the Mississippi River. Mississippi River State Park in Marianna, Arkansas is one of our all time favorite state park campgrounds.
Sounds like a great trip. Have fun. PM me if you want more ideas.