For newer drivers, or those curious, if you’re driving over the road, and especially long haul, you’ll find yourself needing things that, if you don’t have them on hand, might prove difficult or at the least a pain in the ass to acquire. It’s best to accumulate what you MAY need, and restock ASAP whenever you use something.
Just as an example, I carry the following with me all the time:
2 jugs of water
Canned fruit and food
Extra boots (steel toe preferred)
Extra work gloves
3 jugs washer fluid
2 jugs oil
2 jugs coolant
Basic tools- wrenches, sockets, screwdrivers, vise grips
High visibility safety vest
Extra red and blue air lines and pigtail
assorted nuts, bolts, screws
First aid kit
tons of pens
12v plug in fan
This is besides food, clothes, etc..
Be like a highly mobile Boy Scout, be prepared.