$50k fits in three places, and they're genuinely different products.
A single-park syndication is the most common home for that size. A sponsor buys one park, raises equity from a handful of investors, and minimums often run $25k to $100k. You own a slice of one asset, so your outcome depends on that one park's water lines and that one submarket. Most of these are offered under private placement rules that require you to be an accredited investor, and what qualifies varies, so confirm the terms of the specific offering with the sponsor and your own advisor.
A fund holding many parks spreads that risk, and yes, institutional-style funds often start at $250k or higher. Some sponsors run a smaller parallel vehicle at $50k with different fees. Ask directly whether one exists.
The public REITs are real exposure to the sector and you can buy $50 of them. What you don't get is the consolidation return. The strategy in this room makes money partly by buying from small independent owners at prices that reflect below-market lot rents and unprofessional operations, then raising net operating income. A large public REIT already owns professionalized, mostly stabilized communities and trades at a price that reflects that. So it's the same asset class and a different return engine.
The thing to weigh before you pick: liquidity. A share sells in a second. A syndication or fund interest locks up for five to ten years, sometimes longer if the sponsor extends. If $50k is money you might need, that difference matters more than the yield difference.