I'm only aware of one RV Park in the Monticello area. That is Cane Creek State Park at Star City, AR. It is ~25 miles from Monticello. Their phone number is 870-628-4714.
You have the same problem around Magnolia,AR. We have stayed at Lake Claiborne State Park in Homer,LA. It's ~25 miles south of Magnolia, AR and a nice park. Their number is 877-266-7852. There are also several praks around Texarkana,Ar, but I'm not familiar with any of them.
Jim and Lynda, (Sophie, Jake, attack trained killer Shi-Tzus :-))
2003 Fleetwood Expedition 38N 2005 Saturn Vue