Last weekend I had a flat tire. So I pulled over to the side of the road, got out my lug wrench, and attempted to loosen the wheel lug nuts. I could not budge the lug nuts with my L shaped lug wrench so I had to call a tow truck. He used a piece of pipe over the lug wrench handle and got them off easily. What can I do to prepare for the next time I get a flat?