rkfvd3

I recently purchased the premium care warranty for my 2010 platinum and I am wanting to level it and put 275/65/20 BFG all terrains on it. My question what parts will not be covered as a result of the level? I called my dealer and the service guy really didn't know exactly what parts so I was curious if anyone here has ran into problems with parts being covered. I figured for sure parts like ball joints wouldn't be covered. What about tie rods, cv shafts or the idler arm? I'm trying to decide if it would be a bad idea to level it. I could always go with the 285/55/20 and I wouldn't have to level it or worry about my warranty. Any input would be great, thanks