But the back space connected/open with the main cabin.
As pryelluw said (without explanation), you seem to be describing the Chevrolet Avalanche (with an added bed topper like you linked), a truck with a large midgate allowing opening the interior to the truck bed area.
Some pictures look indeed good.
It seems like you're describing an SUV with the third row seats removed?
Honestly I was not aware that Pick up trucks like cars can come with third row seats.