Tons of info on this:
Drive Shaft PM and Drive Train Troubleshooting- For FAQ
https://forum.ih8mud.com/threads/drive-shaft-pm-and-drive-train-troubleshooting-for-faq.80904/
list of sites/links
https://forum.ih8mud.com/threads/upgraded-suspension-components-data-points.54068/#post-607098
I'm...
Damn, @george_tlc those are quite mangled! I'm convinced OP's will definitely last 3500 more miles.
My now spares only had a few mild cracks on the ridged side.
Definitely agree that OP should just carry new spares on the trip.