Just saw this on the Tesla shop today. I'm not sure if it's really out of stock or if it hasn't gone live yet. I'm cautiously optimistic about trying it because it seems to fix the one issue I have with a lot of the other mattresses: using the space behind the wheel well. Ones like Exped are fine for one person, but with two (or one taller person), it's nice to be able to sleep at an angle and have the rear well space for feet. If anyone has already ordered one, I'd love to know what you think of it once you try it, of if anyone has a recommendation for a mattress that uses the rear well space.
https://shop.tesla.com/product/model-y-air-mattress
https://shop.tesla.com/product/model-y-air-mattress