Sorry! My question can sounds stupid, but I'll explain for you!
First of all, I know the difference between IFS and SAS.
Here in Brazil, we have one 4Runner that us know as "Caveirão".
Caveirão use 40" tires and IFS system.
Look him here: TAC 4x4 2013 - 3o dia. Videolog 02 - Transamazonica...