yes it is underneath the back of the car.
Yes
Yes, it comes from the factory with a full size spare and wheel rim identical to the ones on the 4 road tires.
It had one as original eqipment, yes. It is located stored under the body of the vehicle under the "way-back" area.
The 2008 Toyota Highlander has a V6 engine.
The 2010 Toyota Highlander has a 2.7 L base engine size.
The 2009 Toyota Highlander has a 2.7 L base engine size.
The 2001 Toyota Highlander has a 2.4 L base engine size.
The 2002 Toyota Highlander has a 2.4 L base engine size.
The 2012 Toyota Highlander has a 2.7 L base engine size.
The 2008 Toyota Highlander has a 3.5 L base engine size.
The 2004 Toyota Highlander has a 2.4 L base engine size.
The 2011 Toyota Highlander has a 2.7 L base engine size.