I thought the same exact thing when I saw that! I can't imagine there were many that were ordered with that option.
Harrah's? Yeah. They could afford white-walled truck tires. I saw the collection back in '86, took a bunch a pics. I need to pull my pics out, see if there are any worth posting.
I must be living under a rock because I have never heard of Harrah's. There is a town here in central Washington called Harrah. But I doubt there is any kind of connection.
If you went to Las Vegas before, oh, say, the mid-'90s, you would've driven past Harrah's Casino and Hotel, which I think was on the Strip. The museum was on the top levels of the parking garage.