In Alaska we had to be pretty self-sufficient while traveling. In addition to the normal stuff we always carried water and, in the winter, even MRE’s, sleeping bags and a camp stove.
While traveling in the winter, a failure can get serious in a hurry. I once had to change a shredded fan belt at -66 degrees in Tok and then drove home through Mentasta Pass where is was noticeably colder than the minus 66 in Tok.