I've been thinking of getting an extra set of rear tires and wheels for the Z.The Titan's that are on it are fine really. But this rainy weather has turned a few of my accounts into swamps. So I'd can't say I haven't been curious about how a more open tread design would perform. Something more self cleaning. What I really need is to replace the front casters with ski's and put some swamp buggy tires on the rear. But that's another story! Anyways, does anyone have any suggestions, experiences or opinions about open/aggressive tread design. Also, since I'd have them put a new set of wheels for a quick change out, has anyone toyed with different wheel offsets? Either to install wider tires or to change rear track width? I have 20x10-10 rears which seem plenty wide to me. I have very little inside space for anything wider. I have about 3" of track width to play with on each side.