If you really want to do trauma, pick a program in a place that gets lots of trauma. I'm sure the residents at those programs will tell you how much they get. We don't get a lot of penetrating trauma at mine, and I don't mind that. To me it means I'm a bit less likely to step in a puddle in the OR and a bit more likely to sleep through the night. Also, many of the places that get a lot of trauma probably aren't the places I'm going to want to live, but that's just me (or more accurately, my wife).
My buddy is just finishing at an east coast program with plenty of trauma and thinks it's highly overrated. However, if it's what you want to do, then by all means do it. Try a search for trauma anesthesiology fellowship on google, and think about a ccm fellowship, especially one that would allow you to do some trauma anesthesia.