We use the iBuddy dog car hammock, seats down, attaches to the head rests front and back. Comes with a leash that connects to the seat belt connector in case of an accident or a burger in the front seat. Makes for allot of floor space to carry stuff like a cooler and transfers to the car when home.
2020 Montana 3561 Legacy (Because of the Forum), everything except paint
2018 Silverado 3500 DRW, 50Gal Transfer Flow, Andersen hitch.