[ky3]

Spitballing here: more land in the US means lower cost to stock cars in dealerships. Also makes it easier to do an impulse purchase with all the easy financing available, compared to the European scenario of waiting for delivery (and possibly changing one's mind).

[mark-r]

Car dealerships often sit on prime retail locations. So that vast inventory will often sit in a location close to but not conveniently adjacent to the actual dealer.