Static Rollover Threshold
The static rollover threshold (static stability factor): the steady lateral acceleration, in g, that lifts a truck's inside wheels, SRT = half-track / CG-height, plus the steady-curve rollover speed sqrt(SRT x g x R). A 72 in track over an 80 in loaded CG is 0.45 g -- on a 200 ft ramp that impends near 37 mph; a low 96 in-track flatbed with a 60 in CG runs 0.80 g, far more stable, while a tanker or high-cube sits lower. A STATIC screen: suspension roll, tire slip, and load shift lower the real threshold, so slow well below this on ramps and curves. The loaded CG height and the truck govern; not a substitute for driving to conditions.
Formula and source
srt_g = (track_width_in / 2) / cg_height_in; rollover_speed_mph = sqrt(srt_g x 32.174 x curve_radius_ft) x 0.6818 (g = 32.174 ft/s^2, ft/s -> mph).
Static stability factor (static rollover threshold), first-principles rigid-body statics; the track width and loaded CG height come from the truck and its load. NHTSA static-stability metric.
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