Here's my take after watching some blowover videos...
Most that you see are on rigs that are going way faster than they should be, given the windy conditions. The common thing I noticed was that it appears that a gust of wind catches the rig, it sways, the gust dies down for a second, the rig sways back towards center, then another gust hits it again. You literally get a horizontal "porpoising" effect that, eventually, whips hard enough to roll the rig. This can happen to =any= vehicle. Yes, there are some where a huge sustained gust just blows it over, but in many, the whip-saw action can clearly be seen. Driving much slower, if you have to drive, reduces the blowover risk considerably. If I just =had= to drive in windy conditions, I think I'd not only fill my fresh water tank, but my grey and black tanks, as well.
Lyle