Check out www.rockymountainatv.com
and you can get an idea. i use the skat trac hauler but the itp dune star or kenda gecko will do for light use but if you hit the dunes often like i do you will need something of a little better quality e.g skat trac's line of paddles. But that webpage should help you out. Oh and invest in a new set of wheels so you dont have to keep busting your tires off the rim when you change where you ride.