While we were in Vicksburg, MS. for a few days, we stayed here. Although it is part of the local casino, it is far enough away, that you can't even 'see' the gamblers or hear the cha-ching of their winnings! HA!
Price -$23/night for full hook ups
Amenities - they do have a small, but clean laundry and tv room. Other than that, it is a safe, clean park to stay in the area.
If we can make it back to see Vicksburg National Park, this is where we would stay.