"Previously, you had to be in front of the passenger seat mounts. Now, you should effectively be able to use all the way to the rear seat mounts. No?"

Yes. That's why I asked if it will be worth the trouble to move my 40#+/- about 1' from in front of the mount to the back.
[/b]
And I know in most cars that 'in front of the front seat mount' is significantly further forward than 'forward of the aft-edge of the forward-most passenger door opening'. It should give most cars an easy foot or so.