Ultra Heavy Lift. With foam? Yes.

The UHLC
Photo: U S Marine Corps via www.cnn.com
 

  See that "thing" up there?  That is the new Marine Corps heavy lift vehicle for moving equipment from Navy landing ships to shore.  The treads are made of a foam, that provides floatation, and cuts down weight.
  It can carry tanks or large trucks in its cargo hold and can climb walls up to twelve feet high.
Take a look: http://www.cnn.com/2014/07/16/tech/innovation/marines-amphibious-vehicle/index.html?hpt=hp_c3

You will find a video and a lot more information.

Leaving the well deck of the USS Rushmore
Photo: U S Marine Corps via www.cnn.com