My experience with trailer parks/trailers has been somewhat minimal, but positive.
One of my aunts has lived in a trailer (not in a trailer park necessarily) for years and raised her family there, as well. I always loved visiting there when I was a kid, and still do. I have fond memories of poring thru all the vintage children's books she kept in a smallish bookcase in a corner of her living room, and hanging out with one of my older cousins in her room, watching Nick Jr. on her small TV, and admiring the tiny porcelain animals, Happy Meal Toys and Beanie Babies she kept on her shelves. My aunt's trailer is kind of located in a forested area - she maintains numerous bird/hummingbird-feeders and often sees squirrels, chipmunks and the occasional bear.
She also used to take in stray cats and even had a room for them filled with scratching posts and cat houses built onto the side of her trailer, too.
My aunt's trailer has always seemed very cozy and inviting to me, probably because I've come to associate it with family. It pretty much felt like a small house, and there was always room for everybody.
I remember being somewhat shocked and confused when I grew older and learned that negative stereotypes surrounding trailers/trailer parks were a thing. I always thought trailers were really cool, like houses on wheels.
I haven't ever actually lived in a trailer park either, although I do drive by one in particular sometimes....it looks really well-kept and its name has "Flamingo" in it. There's even a sign out front flanked by two pink cast-iron flamingo statues, which I think is awesome.
TL;DR: I haven't ever really lived in trailers or a trailer park, but the ones I've seen/visited seem really nice overall, so if you're thinking of living in a trailer or a trailer park, I say go for it.
I feel like they really don't deserve the stigma that's attached to them all too often.