I'm one of those that likes to have "all the tools to refit the aircraft carrier". :) :E
It's one of the reasons I drive pick up trucks as my tow vehicles, so I can carry the things I want. In the bed of my truck I have two diamond plate tool boxes ( small ones, about 12x12x30 ). Each weighs a total of about 50 pounds. One has tools, the other has things like recovery straps, jumper cables, ratchet straps, etc.
But, having said all that, when I am out, I'm usually on the road for several months at a time, so I want to have the tools and supplies needed to fix the minor things that may come up.