Getting stranded far away from home or in remote areas is a very real possibility in our vehicular travels today. Getting a ride or even help cannot be counted on either (may even be unwanted help), and there is always a possibility of the lack of cell phone service in many remote areas.
I visit or travel through such areas several times a year and I have become temporarily stranded while there. I do not go unprepared!
So, you're stranded in the backside of nowhere in the scorching heat of summer or the freezing cold of winter. A survival kit of sorts only makes good sense. I personally carry a duffel bag inside my vehicle(s) with an assortment of the necessities to endure such a thing, especially if I am traveling into remote areas or during mid summer/winter.
Included in that duffel bag or along with that duffel bag is:
Extra insulated clothing, including socks & boots
Fire starters with matches/lighter
Hatchet
Spare flashlight and/or small LED lantern, w/extra batteries for both
Pillow & small air mattress (especially good for sleeping in rear of SUV)
Small emergency tent & 2 emergency space blankets (in case the vehicle is in an unsafe or very unlevel area - can also be used for shade if needed)
Extra water (1-2 gallons)
Extra food (canned and/or packaged in vacuum packaging), coffee, mixable fruit drink, etc.
Small portable stove (like the one sold on this site). small pan and/or pot, small coffee pot, stainless steel cup
Extra knife (camping knife with spoon, fork, etc.)
Mosquito repellant
Folding stool and/or chair
Along with all this stuff, I normally also carry a variety of tools & emergency mechanical equipment so I can usually solve any mechanical breakdowns well enough to get back to civilization.
Always be prepared for the unexpected and you can deal with it with relative ease!