Actually, the criteria for being designated a Level 1 trauma center pertain to staffing issues (eg must have a 24 hour in house trauma surgeon, with subspecialties such as ortho, neurosurg, etc.) There is no requirement that the center be "academic", or do research.
Reality dictates, however, that there be residents around to provide the staffing, and the rules allow for the trauma surgeon, for example, to be a surgery chief. (esp since there is no board certification for trauma surgery)
At least one of the busiest level one trauma centers does not have a EM program...Memphis. I'm in the process of reseraching them all so if I find others, I'll try to remember to post here.