If my car is handy to my camp site I bring along a cot and lanterns and a cook stove. I also bring extra tarps for a extra ground cover, as well as, a tarp for over a picnic table and extra one for over my tent if needed. I like camping in the State Parks where all my friends and I, still use tents. So tent lights come in handy, plus flashlights for finding the bathroom in the middle of the night. And of course the good ole cooler & lots of food.
If I am camping off in the woods the extra rope and tent stakes, and tarps are still a welcome sight if the weather turns nasty.