I can’t count how many times I’ve come across a forum post asking “what spare parts should I bring?” followed by multiple replies with an absurd amount of recommendations. Belts, radiator hoses, axle shafts, tie rods, ball-joints, bearings, water & power steering pumps, brake pads & hoses, alternator, fuel filters & pump, vacuum & heater hoses, spark plugs, etc etc.
Suppose it’s a personal pet-peeve being in the automotive industry that focuses on maintenance & car care. The goal should always be to address and correct an known problem before it becomes an issue. Good preventative maintenance goes a LONG way when it comes to having to carry spare parts. Inspect, catch and replace worn/common components before hitting the trail. It’s mind boggling how many people just drive their vehicles into the back-country without giving it a complete once over, spending time wrenching instead of wheeling because something simple and stupid.
Before you pull out your pitch fork – of course there is always going to be break downs that cannot be foreseen and stuff does happen, but I’d say 80-90% of issues shouldn’t be issues in the first place. I don’t carry much in the form of spare parts. Basic fluids, spare belt, full electrical bag with testing equipment, tire patch kit, various nuts/bolts and the usual quick fixers like zip ties and duct tape.