Do the newer G-class models (2000+) with automatic climate control have any vents for the rear passengers... Perhaps center of rear part of center console?

Also, can you get a perfectly flat cargo area when rear seats are folded forward completely...do head rests need to come off to fold flat and not impact front seat rearmost position? How does the total cargo area compare to the M-class models... We have large Great Pyrenees Dogs and travel with them extensively.

Thanks!