I was inclined to think that was Photoshopped, but I looked up the Beaver's specs and a couple of quads is well within it's capacity....not sure how well it would fly with those big bricks sticking out like that though. LOL
This is photoshopped.... The quad on the right is the duplicate of the left quad... Tied the same, tow hook same direction, etc etc
Also notice the pontoon under the left side is deeper in the water... Almost a nice photoshop