oh yea, sorry, im linehaul...
back when I was a floater (backup driver, who would be in multiple trucks)
I would take
my melways (street directory of the state I lived in)
Coffee cup/thermo
Bag that held all the different types of "con notes", tape, and stickers.
Phone charger
GPS (garmin truckers one)
First aid kit.
But yea, not much more then that, you know pens and ruler as well..
First rule of thumb we have over here, in the morning, once you work out what run your doing.. ask drivers who drive near/friends with the run driver, where good toilets are (clean, and well stocked)
worse case.. hospitals...
Maybe next time, I should pack some toilet paper.. just incase.