This is an interesting perspective. I went around in circles on this years ago.
What i ultimately decided was that I was going to be prepared to take care of myself. At that point I removed the spare tire, most all spare parts and only a handful of basic tools and pretty much all excess weight. The crew I ran with all had done the same. Seems counterintuitive. But......
Ultimately, the agreement was that we all had built, capable cars and were experienced drivers. We knew the trails and knew our skill levels. If something went wrong we'd all pitch in, but that would mean running back to the truck to retrieve resources. It was the price we were willing to pay.
In the end, we NEVER had a problem. Ironically, on any given weekend, we might run 4 to 6 trails, where the normal group would do 2. They would be plagued with vehicle failures and Trail fixes where we'd have none.
My point is that a light, capable vehicle, built right with the right combination of parts can be indestructible. Why carry a 125# spare tire if you're not going to need it? Most of the so cal trails we ran weren't destination trails, they were out and backs. So a spare could be retrieved if need be. But it was never needed. Run the right tire, never need a spare.
Now, I recognize that an H3 in fairly stock form isn't that vehicle. There are limitations. CVs, steering et cetera. Not indestructible. But the mentality of reducing weight will yield a better return on borderline parts. Lighter car, longer parts longevity.
My opinion.
