Depends upon what type of park you are looking for
COE parks are plentiful. Many have water and electrical hookups. Sewer is usually a dump station.
Examples: Maumelle Park near Little Rock. Some sites right on the Arkansas River front. Reserve early for the choice sites. Some walk ups available but back in the woods.
Toad Suck park near Conway. Also near the Arkansas River.
Narrows or Dam Site parks on Greer’s Ferry lake etc.
https://www.recreation.gov/
KOA Parks. One in North Little Rock
Tom Sawyer Park in West Memphis. On the shore of the Mississippi River
State Parks such as Petite Jean State Park near Morrilton Arkansas, Mount Magazine State Park (highest altitude point in Arkansas) in Logan County,
plus many others
https://www.arkansasstateparks.com/a...ations/camping
There are many other possibilities too. Lots of trees too.
https://www.rv-camping.org/arkansas/