Well lets expand , in the truck is always "gear" for incase .
Carhartt bibs , Carhartt jacket and vest. socks , etc.
snacks and a few MRE's or canned food ( sometimes I get to work where stores are not close so it helps to have something .
shovel, axe , rope, tarp, saw, mech tool kit and all my plumbing and hvac tools.
camera , lots of bottle water , some iced down in cooler other stored in tool box.
first aid kit, bio kit, eye first aid kit , welders first aid kit + all meds and extra glasses etc.
I-pad and cell phone + family radio because it has 5 weather stations . on long trips CB radio and SW radio.
blanket , water filter , pack, several ways to make a fire , rubber boot covers , chain , tow straps and assortment of shakles , on long trips a 5 ft jack and come along and snatch block. and anchor.
of course leatherman tool and good fixed blade knife and machette etc.