I find that all too frequently, discussions of tripod stability talk about weight bearing strength or freedom from vibration (or quickness of vibration dampening being better in carbon fiber than aluminum), but ignore the issue of TRIPOD TORSIONAL RIGIDITY. For this aspect I can offer no easy solution in tripod selection, as no one ever tests for torsional rigidity!
When in gusting winds, all too often long lenses are pushed by the wind to cause the whole tripod to twist about the center column (even when not raised at all), causing the point of focus to be moved laterally in the frame, and NO additional weight can alleviate that problem.
With hanging gear bags, the wind also catches the bag and causes it to swing laterally as well, acting as a pendulum even after the wind has (briefly ) stopped gusting! So while it might alleviate the issue of the tripod and camera being 'lifted' off the ground, adding to the ultimate stability, the lateral pendulum effects in gusting winds remain a significant problem. For that reason, I resort to using a strap hanging down from the tripod, and I STAND ON the strap to make it more difficult for the wind to 'lift' the tripod and camera yet it does so with ZERO lateral pendulum swing.
Nice...i like the idea...even a bungee cord from the tripod hook that you can stand on.
But yeah...long lens is a mini sail.