You'll need a tree strap if you don't already have one. Most offroad parks require that you have and use them on the property.

Smittybilt 4" x 8' 40000 lbs. Tree Strap - CC408

You always should have at least 2-3 D-rings on you.
Shackles - D Ring/Shackles - Recovery


Lower Control Skids : Bolt on. They aren't a fancy designer brand. But they bolt on, and they work. And if they wear out, you can bolt more on in the driveway. Cheap and easy.
http://www.amazon.com/Rugged-Ridge-1...=sr_1_1&sr=8-1

Next would be a rear differential cover. If you catch the bottom lip of the stock stamped steel one on a rock as you slide over it, it pulls the flange back a bit and drains your rear diff and you may not realize it happened. Get a thick cast steel one. I run a Riddler, but any will work. Riddler is very similar to Poison spider, just no spider cast into it.
Poison Spyder Bombshell Diff Covers