For what it's worth, here's a list from a post of mine in 2013 related to this topic thread. We still have the same 24 foot Class C and still travel with about the same items - with the exception of some tire repair items and freshwater plumbing repair items that we've added recently for extra insurance during our off-highway travel. We like to as much as possible be "ready for anything" when we're out and about:
- One-person tire changing capability for any tire on the RV on hard or soft surfaces
- Manual or powered tree-across-the-road cutting capability
- Remote area emergency outside contact capability ... extended range cell phone or satellite phone
- Manual or powered low-hanging-limb cutting capability
- Ladder access to the RV's roof
- Roof/window leak repairing capability
- High strength towing strap/chain capabiliy
- Full size shovel
- Leveling capability for worst-case all four corners of the main living space
- Spare parts for any living space item that could be trip-ending if it was to fail (i.e. spare RV water pump, spare propane refrigerator ignition points, spear propane water heater ignition points, etc.)
- Some spare parts for certain high failure rate items of the drive chassis (tow vehicle or motorhome truck chassis)
- Capability for extended time-period air conditioning in extreme heat that may come unexpectedly
- Capability for extended time-period heating in extreme cold that may come unexpectedly
- Fan capability as a backup to the air conditioning
- Plan B backup capability to the primary heating system
- Multiple ways of recharging the RV battery bank (more than one combination of solar/fossil fuel generator/wind turbine/fuel cell/converter/charger/etc.)
- Crutches (i.e. should someone sprain an ankle)
- A remote inspection scope (i.e. for checking some RV part failure/wire short/etc. in a hard to check area)
- Tire inflation capability for a complete inflation in a reasonable length of time of any tire on the RV
- Ground cloth/cover for inspection underneath the RV in dry or wet or muddy conditions
- Heating pad for sprained body parts
- Inside window insulation material for an unexpected long cold spell
- Vacuum cleaner to keep the interior from getting too gritty in windy desert conditions.
- Outside shower for pre-cleaning muddy items
- Positive awning latch to prevent unfurling in high cross-wind conditions when traveling
- Backup cooking capability to the indoor cooktop
- A backup to the RV's refrigerator ... a cold chest using ice from the refrigerator's freezer ... or an electric powered portable chest
- All the emergency medical supplies you can think of and find a place for
- All the tools you can think of and find a place for
- More than one umbrella for outside the RV in the rain or sun .... or worst-case for hiking in the sun for miles if your RV is broken down
- Spare oil/spark plugs/etc. for any generator(s) you might have along
- A way of starting the main drive engine if the chassis battery should fail
- Capability for off-loading the grey tank into the black tank until you can get to a dump station
- A way of getting water into your fresh water tank from any source
- A water filtration system
- An adjustable roof vent near both ends of the living space, with vent covers over the vent lids, so that the interior can still be ventilated in heavy rains and high winds
- Hard copy maps of a whole lot of areas
- A modern GPS unit fully loaded with maps of all of North America.