Many times when people are blown over by wind, they have actually contributed to the entire debacle with how they respond to the wind gust.
Most people when hit with a hard gust of wind that SEEMS to move their trailer more than is safe will turn INTO the wind...
When hit by a big gust and you can see your trailer lifting turn DOWN WIND (with the wind and keep pressure on the accelerator. Slowing down and turning into the wind shifts the weight and center of gravity of your trailer and truck in such a way as to make it far easier to be tipped over.