Stability with respect to sway depends on the parameters of both the towing vehicle and the trailer. The system will become unstable beyond a certain speed. This speed at which the system becomes unstable decreases, as:
1. the mass of the trailer (relative to the vehicle’s mass) increases.
2. the center of gravity of the trailer moves rearward.
3. the moment of inertia of the trailer increases.
4. cornering stiffness of trailer tires decreases.
5. cornering stiffness of the vehicle’s rear tires decreases.
6. the distance from the vehicle rear axle to the hitch point increases.
7. vehicle wheelbase decreases.
If you really want to know at what speed a particular combo will become unstable you will need to calculate the sway damping ratio for it.
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