RV ovens aren’t known for even cooking. The first time I made a pizza, the gas heating element burned a nasty black stripe in the crust. A pizza stone on the rack will help distribute the heat. A debate among Rv cooks is whether to place the pizza stone on the metal plate above the heating element or on the rack. Since my round pizza stone wouldn’t fit on the metal plate, I didn’t have much choice. Placing it on the rack worked fine for me. If you put yours on the metal plate, be sure it doesn’t cover the ventilation holes.