You'll have to excuse my ignorance on this subject, but from what I've seen and heard, if a tornado hits your home, unless your in a storm shelter 12 foot under ground ,your going to have a pretty bad day, regardless of whether your in a trailer or a 12 bedroom mansion.
With winds in excess of 100mph,and with all the pressures involved, any building not built like reinforced aircraft hanger is going to suffer.
Martin