It is a wonder we get anywhere sometimes.
Despite your focus, rural, urban or suburban, every car needs to have some sort of blowout kit to handle life's imponderables. A good IFAK is just big enough to store beneath a seat but big enough to handle a lot of the first responder issues of controlling bleeding and maintaining breathing. The IFAK is good, especially when coupled with a small, cheap range bag that is packed with other essential gear, more ammo, water, whatever; you get the idea.
In doing some research for some other bit of Tacticool that I found on a facebook auction site, I ran across this little gem that looks promising as a quick reaction bag for really bad days on the road:
But you say, "Matthew, why the hell would I need an active shooter kit in my Grocery Getter"? Well check out the second video and I think you can see the utility a little better.
It makes a little more sense now as a fairly useful, and completely accessible system. The only problem that I see in this is keeping the spouse and kids from stripping it of batteries, meds, band aids, or chemlights.
I can't help you there.