Expanding on
@TheDesertMouse 's post with my exoerience the past couple years...
Agree with the shovel, jack, quart of oil, and lugnut socket advice 100%.
I don't carry the other liquids (antifreeze, etc due to space limitations and stores being everywhere). I carried a scissor jack, hate them, for a year before getting a hydraulic jack. I chose that over a bottle jack because I've been using them my whole life. It takes up a LOT more space than the bottle jack.
To expand on the socket thought, I don't carry a full socket set. I identified the most common sizes I'd need for my van and only brought those. I have a decent sized socket wrench, torque wrench, and extention bar (a long pipe that fits over the two wrenches to get better leverage). I also carry a few other random tools like various screwdrivers and plyers, a C-clamp (for changing my brakes), and other tools I've found uses for. I can always find more tools down the road when needed.
Repair manuals are nice when you don't have mobile data.
Wish I'd known about the "unstuck kit" type thing earlier in life. That sort of thing is mandatory if you're leaving the city.
Always rope, paracord, both.
Agree 100% with the spare key thing as well. Not just for locking yourself out, but if you're traveling with a friend then they will have a key and not always be asking for yours.