Both of my "weather" bags are in the tool box on the bed of my truck. The food, I place behind the front seat when I drive the truck and then bring it back in when I get home. (Just enough food to get me home if necessary) (6 - 8 hours max) Water in a cooler usually stays, but is rotated often. I may change the winter boots out. We have to wear boots (or shoes) with cleats on them at work if snow/ice on the ground. (Required)
There are dedicated Get Home Bags in both rigs.
My Pick up has a small bag as I am usually the only one driving it.
The Van has a much deeper bag as there might be G-daughters with us depending.
They are a serious consideration in our plans.