Two COE parks in Alabama have been updated to FHU and concrete pads. They are Gunter Hill, between Montgomery and Selma and Foscue, near Demopolis. These are two I am familiar with. There may be others.
This is not a CEO park, but McFarland city park in Florence is located on the bank of the Tennessee River. It is very inexpensive (around $20) and accessible to the attractions in the Shoals area. Biking, boating, fishing, golf, shopping and lots of activities in the area. During warm months the city of Florence shuts down main street on the first Friday of each month. Vendors and entertainers are all along a half mile section of the street.
This area has a great history in the music recording industry. FAME recording studio has seen many of the great entertainers during the last 50 years. Lots of talented musicians and singers make their homes in the area.