If you install the 'Quicktime Alternative' player that uses Windows Media player Classic and no Spyware (I got it in the K-Lite Mega Codec Pack allong with Real Alternative), you get the option (after clicking on the movie link) to either Stream it or Download it!!!...
Give it a try!...
Mind you a full 1080i trailer of 3-4 mins is about 100-200mb I think!!!... I usually download the 480p versions and they're about 30-40mb!!...