75 tons is pretty big actually....
here's a few examples:
tidal giant
http://www.hws.edu/news/update/showw...?webclipid=172
Brachiosaurus

Typified by this Brachiosaurus, these largest of sauropods had serrated, chopping teeth and front legs longer than the rear ones, to raise the body up to crop the tops of trees. A Brachiosaurus was 75 feet long and 40 feet tall (the shoulders were 20 feet off the ground!), weighing an incredible 89 tons (more than 12 African bull elephants or three thousand students). The neck was 32 feet long!
http://www.txtwriter.com/Backgrounde...s/dinoBG4.html
Argentinasaurus
Length: 120 feet
Weight: 100 tons
Fear factor: get out of my way
Lived: 65 million years ago
Where: South America
Bookmarks