Having just replaced the second windshield in my 1987 Toy van in the last four years due to rocks hitting and causing cracks, I am wondering if anyone has ever tried carrying around their own rock chip glass kit that they sell for consumers? If so, do they actually work?

The last rock hit 1/4 inch below the top molding and started to crack within an hour - I couldn't even have located a glass person that fast I don't think. Thought I'd try carrying a glass kit myself to see if I can prevent this problem (replacing the whole windshield) from happening again. I had a helluva time even locating a new windshield and it was EXPENSIVE...