The car on record to have the largest Moonroof is European Mercedes-Benz MPV, the Viano. It has two glass panels, whereby one is fixed at the back and another one at the front. This usually works like an electrical Spoiler roof that has an automatic wind deflector. Ford company were the first to install a glass sunroof that was named the Moonroof in there cars. A Moonroof is a simply sunroof made of glass.