sundown sd2 10s in a ported box for DC

possible to have a ported box for (2) sundown sd2 10s if they share the same airspace to fit behind the rear seat in a double cab, 2nd gen?

the depth makes it work, but is there enough airspace to support this application? paging Italian stallion, Mr Marv, and any other audiophiles.

this would hopefully be in a Mr Marv box

 

1.0.ft^3 per sub in a ported box.

You can fit one sub and it will take up the majority of the back wall.

 

right, but if they shared the same airspace, would that suffice, even if it were 1.5ft^3? or you still have to combine the airspace as units for for proper operation?