What’s wrong with trailer parks?It's a big economic disadvantage. Your property depreciates rapidly. Meanwhile, you're still paying rent, and it's easier to get evicted.
What do you propose to replace them with?
How about communities of low cost housing, which allow for lower income people to build equity and which are somehow distinct enough to preclude co-option by well heeled tech employees? Maybe some kind of intentional community with such goals built into its charter?