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Geez, I feel bad for the trees!
Genuine woodgrain interior on most of those cars
In addressing the title of the post, I'll speculate that most of these trees are what I'd call garbage or weed trees: typically fast growing (and weak wood). In the pictures with cut grass, the vehicle serves as a decorative planter.
Probably a lot of Cottonwood, an absolute GARBAGE tree. I purchased an investment property last year and spent over $4k cutting down garbage trees that were surely planted as the result of bird taking a sh*t. A decade ago, you probably could have cut them down in 20 mins with pruners. The wood is useless and even stinks like sulfur when cut... Not to mention the metric ton of "fuzz" that coats every surrounding AC condenser.
On the upside, I'm a hero to the neighbors now.
This one looks like one I've seen here in Minnesota. Now I have to drive by and verify, or add another one to this thread. The one I know of was deliberately put there.
i always considered this as yard art