Well it depends on what you decide you want. I used to run on the dunes down on Cape Cod and I *really, really, really* wouldn't recommend a paddle tire for anything other than a trail-only rig that will be trailered from point A to point B. Driving on anything other than sand tears them up so fast you won't believe it, you can destroy a set driving 1/2" on pavement and when you get a look at what they cost ($1200+ a set) most guys reconsider. If a paddle is what you want though then this is the sort of thing you'll be looking for:
http://www.2xmotorsports.com/Rear_Tires_15...5_16_00_15.html
http://chircoestore.com/catalog/product_in...roducts_id=2464
You maybe want something with a paddle-LIKE tread but still a street tire. Like this:
http://www.ntwonline.com/acb/showdetl.cfm?...1263&DID=48
Or this:
http://www.ntwonline.com/acb/showdetl.cfm?...2306&DID=48
There are all kinds of problems with running in the sand. To start with there are all SORTS of different sand, some is light & sugary while some is hardpacked and then there's everything in-between. The Cape Cod ranger station has an entire 30ft wall *covered* with photos of trucks that got stuck in the sand too close to the water & didn't make it out before the tide came in. Talk about a sobering sight, by the time the tide goes back out there's usually nothing left but an inch or two of the roof/rollbar & the CB arial. Get yourself TWO high-lift jacks, bolt or weld each of them to a good, solid 2'x2' foot so it won't sink into the sand, get a couple/three good quality sand anchors, a winch and a couple heavy-duty come-alongs and make it a rule to always travel with a group or at the very *least* a wingman. Sand can be a whole lot of fun but I've literally seen it reduce grown men to tears and always remember that when you get stuck (and you WILL get stuck) at some point you WILL run out of beer & reality will set in. Practice using the jacks & anchors before going too far because deciding to learn *after* you're stuck is not the way to do it

/emoticons/
[email protected] 2x" width="20" height="20" /> Once you have all your gear & know how to unstuck yourself sand can be a whole LOT of fun, landings are generally softer and if you put the truck on it's side it's easy to tip back & there's rarely any damage.