The extra fuse is a great plan. A few months ago, we were out in Arkansas hillbilly land. There wasn't a town anywhere around us. When we came off the trail and started airing up I hear a pop and the ARB was dead with a blown fuse. My wife asked if I had a backup plan. I told her of course, I have the Mikita portable compressor for emergencies. As I was digging around everywhere in my truck getting wires and connections to rewire the ARB, she asked why I'm not just airing up with the Mikita and I stated "because it's at the cabin".
As I continued to dig in my various bags and tool box for some connections, I found my fuses. I swear, I don't remember buying them because I thought they were too expensive at the Auto store. I guess I got some off of Amazon and threw them in a bag.
This situation made me realize that my storage/organization were a nightmare so I reconfigured all my gear to where it made sense.