Double Trundle Bed?

[JigglyPuff19]

DS would like a double bed, fine. We are moving to a smaller house and his room could be used as a guest room, he could come in with me.
I'd like a double bed with a double trundle underneath, are there such things?

Or what can I get that would give us extra bed(s) for when visitors come?

Plug in inflatable bed. Proper ones are the same height as a normal bed. They can come in all sizes and are really comfy. We slept on one for 4 months!

Thank you, didn't think about inflatable.