If you have a stock drive line
Rear axle shafts
Driveshaft U joints
Driveshafts
Spare Tcase tailshaft if you can find one.
Anything else you want to carry - steetring parts if you worry about them, diff fluid, brake fluid, water, oil, ps fluid, tools, boards, a brake line or two.
Whatever you think might break, won't....whatever you don't have will break. Some things might not be practical, but you never know. I don't think we've had anyone rip a brake line off yet, or snap off a driveshaft, but it's not unthinkable.