SAS is an expensive gimmick. It may be useful in 'best of' situations but is very prone to sensor failure.
Toyota agents will maintain it during warranty but once out of warranty many companies just turn it off because of its cost to replace or repair.
Over rough ground it is a major pain in the *** as it keeps thinking the forklift is unstable. Timber yards beware; this is not the system for you.
In factory and warehouse situations where several brands may be operating; SAS gives a false sense of security as operators tend to drive all machines the same way. Even on a Toyota with SAS, if a sensor fails (and they do often fail), the computer can have its data thrown out of whack and the forklift becomes less safe.
I've heard Toyota agents say the system can monitor extended load lengths but none have been able to tell me how. On a 2.5 tonne truck, if the system still allows you to lift a 2.5 tonne load at say 900mm load centres, the machine is definitely NOT safe. Ditto with a full load under brakes.
Rather than go down the SAS route where clients rely on fallible technology for safety, it is better to build a forklift with a low C of G and install a system like Speedshield to help control and monitor operation.
In the end, if a company thinks that SAS is keeping them safe, they are going to end up disappointed or worse.