I purchased a new RAV4 Limited in July of 2015, and notice many tiny rust spots on the back liftgate. Just wondering if this is a common problem with this model/year. I live in Alberta, and the model was made in Ontario. I had a 2002 model for years and never had any similar problem although eventually there was rust at the bottom of the door. Lots of salt on the roads this winter which likely did not help the situation.