cg between St. Louis and BRanson, Mo

Does it have to be past St. Louis? We were just down that way, had a family thing to do on our way to Branson and stayed at the St. Louis RV Park. Right in town, pretty much just off the Interstate. Basically a parking lot with hookups, but nice shower & bathroom facilities, clean pool, nice folks running it and a super convenient location if you want to do anything in St. Louis before you head to Branson. They have pull through sites that will handle big class A's so you should be able to stay hooked no sweat.

Onadaga State park is a good option. Down the road a bit outside of Lebanon is Bennet Springs, a trout fishing park, but should have room. A real nice park about 11 miles outside of Lebanon.

Onadaga State park will fit your needs. About 7 miles off I44. just go to Mo. State Parks for more info. About 60 miles West of St. Louis.

There is a KOA at Eureka MO. I-44 exit 261

I know this doesn't answer your question but a couple years ago while traveling from St. Louis to Branson, there is a Rest area, somewhere near that Lambert's restaurant, on the main highway going toward but still 30-40 miles away from Branson.....in a word, it was the nicest Rest area Ive come across. Very Large and separate area's for Trucks and RV's...absolutely beautiful stop. If I wasn't already booked at a campground in Branson, I would have stayed their without question.