How about a dual battery kit? Having a spare or dual setup will allow you to get your engine going if one fails and to keep accessories running seperate from your starting battery..
Having a winch is a must in my mind....esp is very remote areas. Digging will get old after a while. You can always use one of your spare/ wheel/ tires as an achor point if you get it deep enough in the sand. In addition, Sand ladders would be best to have on your type of trip.
having a roof rack to put lighter/ bulky items up top would help with distributing your gear.
An off road trailer would help with hauling all that water/ fuel as well. If no trailer, and no fuel drops anywhere, try to keep your water/ fuel as low as you can in your truck. LCOG is important...esp in sand/ off camber terrain.
The Genrite fuel tank is expensive, but a great way to get extra fuel on board without the need of geri cans and taking up valuable room.
fuel, water, food, medical supplies, skids, ucp protection, spare parts, recovery gear are ll very important. Cutting corners on any of your gear can ruin a trip easily enough. Buy quality products that will outlast your trips for some time to come. Cheap/ failed gear on your trip is waisted money and cost you more...even a life in some cases.
...my 2 cents.
