why ? what advantage is there?
As for the ADR's I'd say no it wouldn't - but someone may know.
Advantage would be that they take up a lot less room, especially when not being used, & you could have them there for Justin.
My BiL is a good example - one of his kids has moved back to Oz, with his 3 kids under 6, so Grandma & Granddad now have to act as taxi occasionally, which means getting child seats, putting them in the car for one arvo & so on
Talking on another forum & most people agree that they wouldn't meet ADRs / Standards.