Never thought about the fix-a-flat can exploding. Good point. Mine doesn't roll around, but the trunk gets hot. Hell, I had a home made beer bottle explode in my pickup sitting on the passenger floor board the other day. I thought somebody shot my truck since it was so load and I had glass hit me in the face. It broke my windshield, cut the head liner, and looks like somebody shot the glove box with a mini shot gun. I was lucky on this one.
Cell phone and tow truck is good, except when you are in a place with no service. I have been on roads here in California for an hour or so with no phone service. Besides, half the time the send the wrong type of tow truck.
Scott