Lowering the roof line will help ALOT, having weight in the bottom will help, but I have serious doubts that that car as it is would survive our spring winds.
Let me describe our winds, then maybe you will understand.
Every spring it is common to have sustained winds of 40+, with gusts of 50+. At least once a year we will have gusts exceeding 60mph. Its not just the winds by themselves either, we also have canyons and mountains which will funnel the wind and speed it up in localized areas. For example I-25 runs north-south between Albuquerquq and Las Cruces, along the Rio Grande valley. There are numerous canyons that run perpendicular to the road. Where the road cuts through the hill between canyons we will often get a vortex that actually pushes the cars in the opposite direction of the winds. Then when you leave that section you are crossing a canyon where the wind is accelerated. You should see the tractor trailer rigs rock back and fourth when they go through these sections, its impressive that they don't get knocked over very often.
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