I carry way too much stuff with me in the bed of my truck on trips, but in the end, I don't care... Basically, a full set of wrenches, sockets, ratchets, breaker bar, jack stands, 6 ton bottle jack, an old 2 ton floor jack and so much other stuff, it's insane! ha, ha..
Cardboard, duct tape, zip ties, shovel, battery charger, battery load test thingy, bungee cords, rope, tow strap and on and on... If I have it, I carry it!
Never need most of it, but would hate to be on the side of the road and say... Dang... I got that at home... Should have packed it! ha, ha..
Folks don't take WATER with them to what? Save weight.... BFD... I'd rather have it than not if needed and the weight be dammed..
Just what I do and what works for me.. Your mileage may vary.
Mitch