Tornado Flips RV's in Gautier, MS
http://blog.gulflive.com/mississippi-press-news/2014/04/campers_flipped_by_strong_wind.html
Forum Discussion
A micro burst is tough. I have seen them on the water and when sailing and if a boater was not aware, things could get ugly. Dark us always tough as you can not see the cats paw like depression in the water. If the motorhome was head on or tail on then I would think no issues. Side on might flip a smaller lighter coach with lots of windage.
