Cars, boats, toys, swimming pools, semis, motor homes, 10 cars, and just lots of junk. 

And make sure you vet the sponsor and understand the investment vehicle before you invest.

I always have to tell her that she didn't really know and I won't mention that really, I certainly knew and it was quite obvious.In those days, the amount of people who told me that Investing in "High" priced Brooklyn Properties was crazy.... that $140k for a small 2 family building was a BIG mistake, are the ones that cannot drive their Investment Vehicles the correct way, by looking through the windshield.It's the same today.

Even if that only means a switch to REITs and other vehicles where your liability is truly limited to the cash invested.Be smart but do not get so hung up trying to protect almost zero wealth.

With a Roth IRA, a tax-free vehicle, this may make sense. 

Noise and environmental pollution from vehicles.

A vehicle like this will maintain your 1031-exchange but allow someone else to take over the headaches, hassle, etc and provide you a moderate and stable return.

Turn Key can be great but I've seen a few that aren't and is many cases the upside potential isn't as great as some other RE investment vehicles, passive or active.

We were beating any other investment vehicle out there that year.   

I know my county will not allow someone to live in a recreational vehicle in the driveway or on a residential lot.