OK, here are some possibilities:
Fairview/Riverside State Park or Fontainbleau State Park, which are just off I-12 in Louisiana, and you should certainly be on I-12 rather than on I-10 at this point.
Buccaneer State Park near Waveland, MS. just a bit further on down the road and a bit off I-10.
Any one of these should meet your needs.
EDIT: just noticed you are from Magnolia, TX. We spent last Saturday through Monday nights at the Magnolia Forest RV Park and enjoyed the stay. Magnolia is my wife's home and I first came there as a very young pastor 65 years ago in 1952.