My old setup, for years was 2 1974 SVT's, one with an 810, and one with the venerable V4B cabinet (2-15's,folded horn enclosure).
I used to pack it in a 77 Buick LeSabre.
The V4B in the trunk...bungee the trunk lid...
The 810 in the back seat, bass behind the seat on the floor.
The front...