What about the STU Razorbacks? That's what I'm running on my ride, as well as my Z400... I have the 3-3 off-set on mine. These tires are second to none in the dunes. I've ran the Sand Stars, and the Mohawks, and I'll never go back to either! Memo, next time you're out with us, check out the way they float. The STU tires are hella light, and have the most area of rubber to help keep the quad on top of the sand. The single ridge is a lot taller than most.
Here is a picture of the STU's vs. Mohawks...
Just my .02