At the end of July, the Today Show featured a segment on manufactured homes and how they withstand hurricane-force winds. What they found is that the building codes in place far outweigh those of stick-built homes.
In looking at a sample of manufactured homes that had incurred roof damage, they discovered that these manufactured homes had a carport attached directly to the home/roof frame. When wind entered underneath, it lifted the attachment, which ultimately lifted parts of the roof.
Now, codes that are in place require a beam to be set where the carport attaches to the home/roof area—this results in a barrier between the home/roof frame and the carport, which dramatically reduces the amount of damage imposed.
To better understand the concept, watch the Today’s Show segment: http://www.today.com/video/today/55705369#55705369