35-year-old Benjamin Moore has lived in Mountain Meadows Mobile Home Park, outside Bozeman, Montana, since he was 17. This month, for the first time, he’s withholding his rent.

On May 1, Moore received a rent bill for $947, up 11 percent from the month before, and the second hike in nine months—the product of the park’s sale to an undisclosed buyer.

Moore hung a sign on his trailer that says “RENT STRIKE.” He and his neighbors in Mountain Meadows and nearby King Arthur Park, organized with the citywide group Bozeman Tenants United, are collectively withholding over $50,000 a month from their landlord.

Historically, trailer parks have been a relatively affordable housing option—a third of trailer park residents in America live below the poverty line. But on average, their cost of living has risen 45 percent over the past decade. By unionizing, the Bozeman trailer park tenants believe they might be able to fight the most recent rent hike—especially given the state of their housing.

For years, tenants say, the maintenance hasn’t been attended to: tree limbs hang perilously over trailers, and water shutoffs are a regular occurrence. “I cannot recall a time in........

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