Pare down on the tools
I rode the SandBlast this year on a F800GS, had a great time. XT250 will do fine, although a bit down on power compared to some of the competition. I recommend leaving all the tire repair stuff in your truck. Carry some big zip ties so you can tiewrap the tire to the rim to limp out if need be. Run normal highway tire pressure. In my opinion running low tire pressure in search of better traction is a waste of time, and leads to flat tires, which slows you down more than the mostly imaginary negative effect on traction does. My kit: some duct tape, tiewraps, wire, 4 inch longnose vicegrips, 12" crescent wrench for bending levers and pedals back into shape, also doubles as a hammer, and can be used on axle nuts.