Don't overdo it. A Golden Spike trip is 40 miles roundtrip from town. Figure 1 gallon per hour on the trail, and a full tank ought to be plenty. When I ran it in April, I used 8 gallons...
Weight is one of the biggest detractors of 4WD performance. You might argue that on a 6000lb truck, it won't matter anymore. Still, no need to carry extra stuff you won't need.
x2, its not a crazy outback trail that if something really goes wrong you will be stranded. There will be a group running crack and back. So we will all be in the same general vicinity. If the need arises just give us a shout, cb or cell phones work up there most if not all of the way.
We've run parts in a few times.

It's needed for a run on the 'fecta.

