A vehicle that weighs 2, 3, 4, etc..... times more than a squad car will still fly far enough to kill someone inside of it.
Laura
I mostly agree, Laura, but if it weighs a lot AND sits flush to the ground, it will be capable of sustaining MUCH stronger winds before being blown to Oz. I have been a racing fan really all my life, and so I've picked up a few basics about aerodynamics. If you keep air out from under a vehicle it is very stable. The TAV's problem, IMO, is that it is so slab-sided. The forces of wind hitting it from almost any direction will exert great lateral force to the vehicle, eventually rolling it over. The greater the vehicle's weight, the stronger the wind it would take to roll it.
Don't forget that a NASCAR racer can drive at 200+ mph, but only because of many millions of $'s in research spent to make that possible. They are designed to go those speeds only with 200mph wind pressures from the front, of course, though, not from the sides or rear. For safety reasons (for when a racer gets sideways), they also design the cars to withstand lateral wind pressures, but with less emphasis than for when the cars are going in their desired vector.
A bit of trivia that I love: An Indy Car or Champ Car, in it's short track oval or road course configuration, has enough downforce that, at about 100mph, could run on an upside-down track, like running on a giant ceiling. This would, obviously, only apply if the car is going forward.