Checking the AR state parks website last night, I find they are now using an ActiveNetworks booking sysytem (same company and same basic software as Recreation.gov and Reserve America).
You can now reserve a specific site. Something not possible with their previous software.
An improvement for some in that you can know which spot you have. Some dislike the lack of ability of the park staff to ensure best utilization of the various sites. i.e. A 23 ft TT can reserve a 60 ft long space, the staff can no longer put them in am appropriately sized space.