High Wear Items

2 Part Question:
I was wondering, from you guys who have experience doing long trips in your XP1K, what are some of the ‘high wear" items? Things I should keep an eye on and / or bring with me on a long trip through, say, Baja or something…
2nd Part: What do you bring with you on long, multi day trips in the way of tools, spare parts, ect.
I’ve already got a handle on H2O, food and beer…
Thanks for your input!