I moder the spare part that makes more sense now.I would never. I just want a spare, just in case!
All excellent points! I DM’d you.Assuming we're talking about trail spares here - it's possible to go overboard.
Yes, we've all seen the MORR youtube of the rescue of the diesel wrangler that had complete electrical failure on the trail in Utah, and had to be towed out. It's not completely clear that an ECU would have helped there though - that might have been a harness failure. Maybe even the BCM. Just no way to know for sure. And the failure drained the battery. So a spare battery would also have been required.
It's also true that particular jeep had a history of electric gremlins, and the owner knew there was a risk they weren't sorted yet.
We like to think we go to pretty remote locations, but if you're travelling in the lower 48, and you carry an InReach or some similar, pretty much anywhere you can be reached by some recovery company or another. Or informal rescue groups like Norcal 4x4 Recovery. Granted, the cost is steep.
When Jeeping alone, it pays to be prepared for the most common breakdowns, sure. (Spare tire, basic tools, bailing wire, zip ties, gorilla tape, etc...) but then to equip for breakdown by having communications and also being ready to spend a night or two on the trail in the current conditions. That can be a better use of limited storage than trying to carry every conceivable spare and tool.