That is not an option for the 4Runner unless you want to drill your own holes on the driver's side. I inquired about this to Ed Martin Toyota (Indiana) which is also a member of this forum and got the following response: "...there is only one mount point on the passenger side. Personally, I don't see any need to have one on both sides and would certainly not want to drill in the frame. If you were concerned about needing a 2nd mount point, I would recommend a hitch recovery adapter."