Not much really. I worry quite a bit more about my older trucks, and carry more spares, parts and tools vs. the GX. Off the top of my head:
- 10, 12, 14, 17mm socket set and wrenches. Plus lug nut wrench
- flat head and phillips head screwdrivers
- needle nose pliers
- vice grip or clamp
- bailing wire
- a bit of copper wire (like 14g or so) and a couple sized ring terminals
- fuses. regular and low profile in the standard amp varieties
- multimeter for longer trips
I dunno. Maybe some toilet paper as well.