That is a good list, and I encourage you to bring anything that you would typically take camping. I would not worry about vehicle modifications, there are plenty of great trails that can be driven in a stock 4x4.My schedule is still up in the air right now, but if I make it I'll most likely be leaving Hendersonville sometime Friday. I'm not certain what must haves you're referring to, if it's vehicle mods or camping supplies, but here's some of the things that I usually try to have.
Water (on avg a gallon a day)
Snacks (for when you're on the trails)
Camp Chair for around the fire
First aid kit
Recovery points on your vehicle in case you need to be pulled out or pull someone else out.
Extra shoes and socks
I'm sure others could add to the list, but this will get you through most camping weekends pretty well.
Let's try to rendezvous at the South Welcome Station in Dover, TN at 12:30 PM on Saturday the 21st. Here are the coordinates for the welcome station: 36.520124, -87.917709. I plan on leaving Nashville at 10AM Saturday morning. PM me if you would like to meet up and caravan at that time.