2 x 4's work great, as do 2 x 2's. I'm currently working on an idea some one came up with from another forum. Using threaded rods so the bracing doesn't take up hardly any room at all. I'll let ya know how it comes out. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif