Appollo microwave metal tray missing

I have an Apollo and I have an Advantium. It's quite possible that the difference in how the glass tray is used has nothing whatsoever to do with the glass or the temperatures. Both ovens rotate the food using a center spindle on the bottom of the oven. The difference is that the Apollo glass tray sits on top of the spindle, mating directly with it as with most microwaves, while the Advantium has an adapter that mates with the spindle in the center, and with the trays near their outer edges. The glass and metal trays are both designed to sit on the adapter. I don't know the real reason for the difference, but one possibility is that the Apollo system has a lower manufacturing cost but causes a loss of 1" to 2" of oven height when the metal tray is used. The Advantium system does not cause any oven height loss.

FYI for lurkers, the Advantium is a combination microwave, convection, and infrared light device. I absolutely "love" it and wish there was one in the RV instead of the Apollo. It's not that I hate the Apollo, it's that the Advantium is super-duper nice.