I did forget, someone wrote and asked . . The front passenger seat takes the bulkiest equipment. I've considered a roof top rack for it since I don't care its bulk. It actually isn't much different than a passenger, but I don't carry passengers often. The dog walk planks, the jump bars and the second tire go in front.
Various miscellany occupies the door pockets and glove compartment.
A simple listing of all the dog-play pages. For information on linking and other uses of my material see my copyright page.