I knew a dude who fit his whole rig into a Hyundai sedan.I can fit my 6x10 across the back seat of my 2011 fiesta... don't think theres a way to fit the 810 unless its a hatch then you should be ok
Doing so involved opening both rear doors and the front passenger door, as well as folding down the front passenger seat. He'd slide the fridge in from the rear left passenger side, then reposition it so that it was across the front passenger and rear right passenger seats. Head and bass went in the trunk, and he still had room for a passenger in the left rear passenger seat.