Oh yeah, I should mention, we also have a Honda Odyssey. The payload of the Odyssey is about 1400 lbs - which is about the same as an NBS 1500 truck. Forget about ground clearance - you've usually got about 4-5 inches in an Odyssey, but fully loaded it'll drop about two inches. If you live down a gravel road and need 4x4 to haul drywall in the rain this won't work.
Honda got around the "fold flat seats are less comfortable" issue by just making Row 2 removable. Takes five minutes to get the seats out. The floor is nearly but not perfectly flat so I'd use a base piece of plywood before stacking the drywall.
The minivan - and the trailer for that matter - have a low loading height that is welcome with big stuff. The NNBS just sits taller in the rear, an NNBS 2500 doubly so. The '15 and newer SUVs are even worse in this regard - loading height is something like 38 inches.
I do think the NNBS is just a hair longer but it doesn't help too much.