Here is a list of other useful equipment to take on a trip to the outdoors. Make sure to try out any new equipment beforehand so you know how it works.

• Shovel - Even a small folding shovel is better than none. It could be the difference between getting unstuck or not. They come in useful if you have to go to the bathroom too.
• Motor oil - Amazing how often this one comes up. A quart is minimum but enough to do an oil change is better. Most vehicles have great spots under the hood for extra fluids. Trans and brake fluid are items I take as well.
• Toolbox - A full complement of tools is nice. Don't forget parts including nuts, bolts, wire, duct tape etc. If you have a repair manual for your vehicle, keep in mind that it doesn't help much if it's on the shelf at home.
• Gas can - Useful for extended trips. Otherwise the rule of thirds is good for planning. 1/3 to get there, 1/3 to get back and 1/3 as reserve.
• Jack - The bigger the better but convenience sometimes doesn't allow a monster.
• Tow Strap - The longer the better. Strength is usually not the problem. A 3/4" shackle from a local hardware store is a good idea too. A couple of rachet straps are good for reattaching broken suspension parts.
• Jumper Cables
• Maps, Compass & GPS - In that order of importance. Getting lost is no fun. I have a basic Garmin etrex. It is a decent product about the size of a cell phone. It's water resistant, tracks a dozen satellites to get accuracy down to about 15ft, stores multiple tracks, waypoints and one route, PC interface capable, shows you elevation, speeds, heading, bearing, time to distance etc. Things I don't like about it are: naming of waypoints only allows seven characters and it easily looses satellite signals. For about $100 you can't beat the price though. More expensive versions look the same but have better receivers that work indoors, as well as street and terrain mapping built in.
• Communications - Most 4wheelers still use CB's though FRS radios are becoming more common. Cell phones won't have service in remote areas.
• Cameras and video - It's always more fun when you can bring the memories home. Digital cameras are all the rage. I recommend Canon or Nikon. They know how to build proper cameras.
• Food and Water - Don't leave home without it no matter how short the trip.
• Warm clothes - Preferably no cotton since it doesn't keep you warm if it gets wet.
• Buddy - Try to go with a group of vehicles or at least a second unless you will be doing trails way below your ability. If you are going with one vehicle, invite a friend along. It's more fun that way. Besides someone has to push when you get stuck.