My list would be a spare set of sensors.
Spare fuses with some basic wiring repair parts and various bits of different size wire.
Rubber fuel injection hose with high pressure clamps and a few short pieces of 3/8" and 5/16" steel tube for repairs.
Tire valve stems, valve cores, valve stem caps with seals in the cap, metal versions. Valve stem puller.
Tools to break down a tire.
Spare serpentine belt.
Engine oil, filter, power steering fluid, brake fluid and a couple of gallons of water in very tough containers. The container can be cut to make a drain pan if needed.
Spare ignition key taped inside vehicle.
Make sure the jack works and you know how to use it. (not implying you don't)
Small bag of various nuts and bolts that will work in control arms and trackbars and on the tie rod ends.
The putty stick type epoxy that you cut off a chunk and mix together to make a patch. 5 minute type with one for plastic and one for metal.
Drywall mesh tape. It can be used to repair a radiator if you use some 5 minute JB weld.
Small sheets of coarse and medium sand paper for scuffing metal and plastic to make repairs stick.
Good coarse and fine files in large and small.
A few lugnuts that fit. You do have an extra on each wheel if you need them. Pull one off of each wheel to hold on the 4th.
Cleaner, brake type or similar to remove grease and oil to make a repair.
Razor knife with spare blades. A Multitool with a knife is fine but most don't keep them sharp and there are times you need a razor sharp blade.
Zip ties but check them from time to time because they are nylon and dry out which makes them crack under load.
Small ratchet straps with good ratchets, multiple use to move stuff around if needed. Straps can be robbed for other things. Tourniquet, splints, emergency trackbar, tie steering gear back to frame.
Mopar RTV for gear oil. Works to patch oil pans with some duct tape over the RTV to hold it in place while it cures.
Duct and electrical tape. Silicone fusion tape.
Develop a maintenance list of things you check on the rig before you head out. Not overkill but just keep and eye on things so you are very aware of how the rig is doing. Have fun, be careful and I hope you never need a single item on the list.