If you really want to recession proof your finances then real estate only is probably not the best vehicle.

On what grounds can I sue a wholesaler New Western Acquisitions to be precise.

I guess if I were to narrow down my class of tenant though, potential tenants would/should own vehicles.

That is precisely why median is used in real estate, rather than mean average. 

I assume we need to hold those properties in the investment vehicle?

It seems like Investing is still a great vehicle to realize your WHY.

We purposely bought vehicles known for longevity and high resale instead of buying something fancy.

However please note that if you already have Roth IRA - it can't be rollover over into Roth Solo 401k as IRS does not allow this, in such case your only option would be self-directed Roth IRA.Ability to make large contributions to a Solo 401k make this great tax-sheltering vehicle, but the investments you make with either one will not affect your personal taxes because both are considered "qualified retirement plans" and will not have any effect on your personal taxes. 

Post a sign that states no parking, all vehicles will be towed. 

I suggest calling local banks and financial institutions to see if any offer these kind of financing vehicles.