I made some interesting research regarding Roll-sensing side curtain airbags (RSCA). It looks like Toyota knows very well that this system is needed in SUVs like Land Cruiser 120 Prado. See why. (PLEASE TRY THE LINKS TO CHECK THIS DATA YOURSELF)
Toyota installs this safety systems into their SUVs:
Land Cruiser 200 (V8),
They also install it into Lexus SUVs:
Other manufacturers know rollover safety air bag curtains importance for SUVs also:
Nissan Pathfinder has "Roof-mounted curtain supplemental air bags for side-impact and rollover head protection for all three rows of outboard occupants".
WV Touareg has "Rollover sensor system - it is employed to record the vehicle turning angle and the turning speed; it determines whether the vehicle will encounter a possible rollover situation; the sensor data merges with the determined parameters of the acceleration sensors in the airbag control device; if an analysis of the data shows that a rollover hazard is present, the side curtain airbags are activated to reduce the risk of injury".
Volvo XC90 has "Roll-Over Protection System (ROPS) ...But if it does roll over, an electronic sensor triggers the IC inflatable curtain and seatbelt pre-tensioners".
SO WHY RSCA IS NOT INSTALLED IN LAND CRUISER 120 PRADO?