Ultimately it depends on what type of sand riding...drags, trails, drags & trails, hill climbs, etc. However, if you want the best sand tire/wheel combo that will cover all of the above equally well and looks nice, I completely agree w/ msprouse. The skat trak haulers in the 20/20/10 w/ 9-10 paddles hook up excellent for hill climbs, straight drags, and trail riding. If you feel you've got a machine that will put enough power to the wheels that you need the extremes then pony up the extra money and get them. Remember, the softer the sand...the lower the pressure.
Have fun and throw some sand for me.