With or without the rear seat cushions removed? In the 210 wagon, the rear seat cushions are folded forward against the back of the front seats and the backs of the rear seats are folded downward. However, it's possible to lift the rear seat cushions off of their pivots to add an additional 4" or so from the tailgate. Of course, you have to decide where to store them and the head rests.

If your looking to haul something very long, then you should know that the passenger front seat can be moved all the way forward and the back lowered until it sits below the folded down rear seat back resulting in a 'tunnel' about 2' wide from the tailgate to the dash -- about 10'. Again the rear seat cushion needs to be removed for that configuration and nobody can ride 'shotgun'.

I'll check and post dimensions later if no one responds.