No they don't. But people have built supporting structures that rode over the folded back seats and the spare tire well and mounted blow up mattresses, etc. Use the search capability on the site and youll see some examples.Anybody removed the back bench? YouTube wasn’t clear: do the seat backs lie flat so that you could sleep back there?
My wife, me and a small dog used to sleep in the back of our 4Runner. Close quarters but mucho fun. The Rav actually looks wider between the wheel wells.