Here are a couple pictures of 28x12x12 Duro Buffalo tires on my Max IV. Figured they qualified as big tires so I placed them in this thread.
They fit very well and ride like a dream at 2.5psi. I had a chance to take them in some gooey mud at the edge of the pond and they work as good as tires can be expected to work. They however DO NOT SWIM. They do have a ton of floatation and the Max was as stable as could be. In fact it was hard to rock it side to side. These are the tires I will be turning down to fit my 980 Hustler to go into Adair tracks. At least then they will swim.
Keith.