I also read a part of the book so when you say you try to think "I really like this car", shouldn't the thought be "Boy imagine I'd lose this car today, or maybe it gets robbed, I better enjoy it before that happens" instead? At least that's what I got out of the book, to excercise "negative visualization regularly.
I like to practice this own philosophy in my life to remind myself that no matter how frustrated I am with my possessions or with my work that I could be in a much worse place than I am currently. It also helps, a lot, to be a minimalist because it makes you all that much more appreciative of the few things you have (especially when you own good ones!).
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Now you can have it with you at all times.
Do the same with the Meditations: https://www.gutenberg.org/ebooks/2680
If anyone can link to more readable editions that can be downloaded it would be nice to know.