As just about anyone involved in trucking can tell you, changing a commercial truck tire is nothing like changing the tires on a Honda Civic. It requires specialized tools, an abundance of space, and a lot of time — not to mention some serious elbow grease. It’s rarely the kind of thing you can do on your own, but it’s definitely not the kind of thing that you can ignore. When it comes to understanding the importance of capital, it can be helpful to think about the importance of changing a blown tire. Let’s put it this way: you’re driving…