I carry stuff. No sleeping bag or tent though because I usually don't have the space for it unless I'm camping. Kinda wish that pickups would have a toolbox or something built into the beds like they did back in the '70s, it'd give me another place to store things, especially in my F-150. Actually I've been thinking of trying to modify the bed to make a toolbox, but I have so many other projects that can't wait so it might be a couple years before I get to that.
And I quote part of an earlier post of mine in this thread...
"I always carry a small duffel with a complete change of clothes, two t-shirts, two pairs of socks, and a lined flannel shirt. I usually also have at least one sweatshirt in the truck too. And when I go somewhere in the winter I usually take an extra coat along. Plus I have a shovel in the back, couple tow straps and shackle, couple MREs, foil "survival" blanket or two, couple packs of those Lance snack crackers, small bottle of rum (survival rations), sturdy knife, matches and lighter, two flashlights, cellphone and CB radio, and I always have water on hand. Plus all the tools and such that is usually in my trucks."