For grass dirt and sand, I like the badlands in the monster truck line and for the 40 series in like the mashers and the moabs. The mashers have a real monster truck look to them and are really cool, but I think that the moabs are better tires.

As for the wheels, I've just been using the prolines, but I'm running 23mm hexes and proline is the only company making wheels for 23mm hexes that fit MT size tires. When running 17mm, I just went with the ofna. They are a bit less expensive and come in sets of four.

If you want cheap bashing tires, check out a guy on ebay that operates a store called suprasales.

What are you putting these on? The 40 series tires and wheels will add a couple of pounds when compared to a set of MT racing tires, like holeshots.