Just picked up my 1st propane smoker (Masterbuilt 2-door). Got tired of the continuous battle of keeping a constant temp on my cheapo charcoal smoker. Read a few forum threads, but have a few questions to help get me started.. Hope you can help. 1. As many probably know, the Masterbuilt water tray is very small, however I will likely do as others suggest and use sand/gravel. Is this small pan big enough when filled with sand for this heat sink purpose? 2. If using water tray for sand, do people suggest still adding a tray (disposable foil pan or something) filled with water? 3. The smoker instructions say do not use wood chunks. Any idea why this is? Seems like on these threads most people suggest chunks. I am going to add something on top of the cheap wood chip tray to prevent flareups either way. Thanks for the help. Looking forward to first smoke!!