TIRES: I recommend no less than 31" tires, and that's only if you're ok with dragging bottom a lot. Have good skid plates. Have tires with good sidewalls, like BFG's with a 3 ply side. They're my favorite. To many folks, 33 inch tires are barely adequate. That's what I run, but I drag a lot. But you can do the trail in 31" tires. Just know you're going to drag and bump.

LOCKERS: I suggest you have one locker in the rear. For me, with plenty of pavement driving, I am partial to ARB Air Lockers. They really do the trick for me. Plus I can disengage them while on pavement. I have ARB's front and rear. They have been a life saver for me on more than one occasion. If you're doing the trail with others, and you do not have lockers or limited slip, then put someone in front of you who does have lockers and can tow you out of bad spots.

ACCESSORIES: Have a Hi-Lift jack and a CB along, as well as your first aid kit. Extra water is always a good idea, as well as some survival stuff (food, blanket, fire starter).

LIFT/SUSPENSION: This is a never ending debate, but I suggest you tackle the trail with no less than 2.5 inches of lift. 3 or 4 inches would be better. Again, be prepared to do some bumping and grinding. Use a spotter; be careful; and don't be afraid of a tow strap.

CLUBS/GROUPS: I recommend you tag along with a Rubicon experienced group for your first time out. Get the books and maps that show the trail; stay on the trail; and learn from folks who have done it before. Join a club if that's what it takes. But don't do the Rubicon alone for your first time. Take a Jamboree or other commercial outfitter through if you want a fun experience and don't have a group to tag along with.

WINCH: This is optional in my book -- although I never run without one. But I seldom use it. A good rig in front of me, with a tow strap, is very handy and faster than a winch. Nonetheless, I would not have a 4WD without a winch just for peace of mind. It's there if you need it.

RACK: While not trail essential, I consider a rack an indispensable part of my Jeep. I don't have a clue where I'd put stuff if I did not have a rack on the back.

Here's an article I wrote on the subject of setting up your 4wd in general.