Hopefully others will be able to chime in and offer suggestions.
On another note if St. Louis is anything like here in SoCal I would recommend booking the campground ASAP. Almost all state parks here are booked solid for the summer months when students are out of school.
Great choice for "Living within my means" and camping for one...
2011 Salem Cruise Lite 20RBXL & 2011 Toyota Tundra Dbl Cab
Camping History: 45 Trips / 133 Nights / 3736 Miles
FRF Social Group: Campers of the West