Just a thought, but the majority of parts that you might need will be available from "the regulars". It might make sense to leave the bulkiest in a tow rig at Loon, and travel into the springs lighter. Most guys are pretty good about giving you their spare, and letting you replace it once you get off the trail. You could even leave it a Robbs resort if you are leaving earlier.
I used to pack a ton of stuff, but have since lightened my load, and left 3rd members, and some other bulky items with tow rig. Makes packing/traveling easier.
Most common major damage is birfs, pinions, and xfer cases. Carry anything special to your rig (Heim joints, HEI, TBi, etc).
72 FJ40 * "Mudrak Improved"®
07 TRD FJC