I have to disagree about not needing tools on the side of the road, I've needed some a lot, and in many situations didn't have the right ones. Maybe it's because my family and I drive cars until they cant possibly drive anymore, but way more goes wrong with them besides just fuel injection and computer related stuff.
For example, I would add some wire clothes hanger or something to your emergency toolkit. My brother had his muffler hanger break off and was dragging his muffler down the road. I drove up to him with a wire clothes hanger and rehung his dragging muffler so he could be on his way. (later we bought a new muffler and installed it.) At least up here in the salt belt, its a good idea.
screwdrivers utility knife and regular (and maybe needle nose) pliers. I've had vacuum hoses come loose, tear, and in one case, blow off with such force, it disconnected all the vacuum lines! My brothers old Chrysler LHS blew off all his vacuum lines at startup once. Luckily I had pliers and a screwdriver, and reconnected every last line.
We never found out why they all blew off like that, but it never happened again.
Another thing I've learned to have is fast drying epoxy putty like this:
I was riding along when the LHS's coolant overflow bottle got a hole in it and sprayed all of it's coolant out.
Luckily, there was an autozone right across the street in that case. We bought some of that epoxy, patched the hole, filled in some coolant, and were on our way (water would have worked too in a more emergency situation).
of course these tire repair and filling essentials are great if you were to damage more than one tire, or if your spare ended up being flat for some reason:
For dead batteries this is also essential:
you don't have to count on others being around for a jump if you have a dead battery. Tons of stories with this thing.
So there are a ton of roadside stories I could tell, but needless to say, there are a lot of things you can do yourself to avoid a tow. Besides the stuff I mentioned, a socket set (with metric and standard) would help for more serious repairs.
Maybe even add some spare fluids to your trunk like a quart or two of the proper weight oil in case you end up having a slow leak your unaware of and unexpectedly get a oil light.