all of us have put a few things that may not be on everyone's lists. Maybe we could all share that little item that could make life easier if we have it, but others probably don't have on their list.
Ah. You mean truck- that is, portable, tradable goods people will want that you can afford to carry or stock up on.
I'm in the process of writing an actual book about this very subject, but.there are no end of lightweight compact goods average people will want badly if things go sideways.
Think compact and work your way out from the most basic survival triangle. The knowledge of how to make a fire, purify water with sand filters and make shelters in the woods take up
no space in your head. Always start with knowledge and build from there.
After knowledge you can look at fire starting tools: Tiny disposable lighters and butane hand torches, strikers, storm matches and magnesium shavings.
Next we can stock water purification tools: lifestraws, water purification tablets and hypochlorite powder.
Then we can focus on shelter: space blankets, cheap tarps and paracord.
Lastly we can focus on speciality items, with the understanding that such things are often only good at specific points in an event.
Ebooks in a cellphone accessable format like microSD cards have serious value: humanure handbook, Earthship manuals, US Army manuals, porn or music collections and others
Navigation tools are hard to replace: compasses, local maps, whistles, chalk and even pencil and paper.
Tiny sewing kits. Eyeglass repair kits, Solar USB chargers and AA-powered USB chargers as well as a few of the endless items that usb charge like flashlights and cell phone cords
You might want to stock extra Radiologicals: KI tablets and other chelating agents.
If you have access to them, Biologics: Antibiotics, antifungals, vitamins, minerals and so on.
Maybe seeds for a garden. Perhaps hard candy. Maybe decks of plastic cards or dice.
If it's useful, small and compact, it'll have trade value in a pinch.
These things all have one thing in common: they are all compact, lightweight items that people will give a lot for if they don't have them.