Don't tell them you did not use the metal tray and you should be fine. I think they way the metal tray works is as a reflector of the heat to make the heat uniform around in the oven, not just on bottom or hot.
Broome101
2005 F350 PSD,SRW,CC,LB, King Ranch, 4x4
2005 3685FL
http://www.picturetrail.com/broome101
