Can somebody give me the dimensions of the grate? I'm wondering if this will fit: Do you use two or just one? I'm reading a lot of sites/reviews recommend using two so small chunks don't fall through. I think I'm buying myself one (18.5 WSM) as a wedding gift, a couple months early, as well as a Weber One-Touch. I've never had a charcoal grill and have always wanted to give it a go. That will mean that I have 3 smokers and 2 grills. That may be a bit overkill, no?