At what point does everyone start hauling around a complete spare truck??
Lets check the list:
supplies for a complete oil change.
supplies for a complete coolant change
a spare every filter, screen, airline, coolant line, oil line on the truck
a drive tire
a steer tire
an ECU, TCU, Lighting control module, a laptop with manufacturer software to configure them
every tool know to mankind
Where does the madness stop?