I like the maxx bodies, myself - they're a bit wider and give you more of a 'monster truck' look. ...or at least if you want a more realistic appearance, the fenders are a bit closer to the wheels. (a 6" wide body on a 13" wide truck just isn't realistic in my eyes!)

With the wider 'maxx bodies, your truck looks a lot more like a real truck that's been lifted and fitted with monster mudders. ...it's perfect