sorry this is a little off topic but i need to get around the dunes in my four wheel drive, whats the best sand tire that will still give decent traction on grass etc

 

I've always used BFG All Terrain. I run 33x12.50 15"s on my jeep and air them down to about 8-10 lbs psi. Just don't air them down too much so you won't break the bead and be careful making sharp turns so the tire doesn't fold over. I go just about anywhere.