John, Looks like you have a serious problem! I too drive (a car, not a semi) a lot to see our clients around Texas and am constantly slamming on the brakes because a good shot catches my eye. So it looks like you have or will have a problem if you keep pursuing this photograph passion. I'll warn you now to get out while you can. It's very addictive. You see, a true photographer can't pass up an opportunity to take a picture. Yet, if I understand the trucking business correctly, a good truck diver doesn't stop! Good luck! :-)