First some questions:

''and tumbles 50 ft. down a ravine and is caught by the trees.''

Can you get out, or are you balancing on the edge?

''About half way down the trunk pops open and your overnight bag/supplies begin to spill out as you finish the fall.''

Does this mean you have no overnight bag? Or can you retrieve them?

What sort of equipment do you have: Your BOB-bag or just whats on your person?

''and can not be moved.''

Not moved like climbing out of the ravine, or not moved like serious cervical/ spinal trauma, where they can't get out of the truck?

''How do you survive the 63 hours''

Should I also describe patient care? Do you really mean 63 hours or maybe 36?