So the criteria is big but gets good milage and towing isn't an issue (even though we are in the "tow rig" forum).
I haven't seen a bench seat for up front. My guess is it isn't offered as a factory option for liability reasons or costs (no airbag).
None of the car based mini vans seat 9 that I know of.
The only vehicle that I can think of is one of the big vans. The Chevy/GMC Express or the Dodge Sprinter. The Sprinter comes standard with a 6 cylinder diesel that gets good milage, but they are fugly IMO.
