The rollover angle is...
One more degree than
THIS. 
But since you asked for a specific number...
Search Google, "Rollover angle Land Cruiser 100"
Rollover Angle (Slant): 45
Approach Angle: 34
Departure Angle: 26
Diff Lock: centre+rear
Diff Lock Position: centre+rear
Gradient (Incline): 45
Low Range: yes
Ramp Angle (Break Over): 155
Ride Height Control: yes
Rollover Angle (Slant): 45
Self Leveling Suspension: yes
Stability: no
Wading Depth: 700
http://www.car-specs.co.za/toyota-la...-11-specs.aspx