As mentioned. the 3rd row has a wee bit more width but not really any more length/depth. It might be time to consider an XC90...or a Mazda5 if you absolutely have to avoid an minivan or SUV.

Another option is the mislabeled "CUV" known as the RAV4...It really is just a tall wagon with tires that are bigger than necessary. Think of it as Carolla with a glandular problem.

The only RWD options that come to mind that are not a SUV are the Mercedes e-series wagons. I still would not want to be a full-sized teenager in the back of on of those for more than about 15-20 minutes, but the biggest difference is the depth of the foot well. It is a good 3 inches deeper which keeps the occupants from being so close to chewing on their knees.