San Antonio has a lot of these types of properties and Air BNB'ing them is a very popular option. 

I know that doing an FHA mortgage is quite popular on BP because it is a good way to get into real estate investing with as little money as possible.

Owning stock certificates back then were popular just about any man owned Playboy stocks.

You may want to find one that is not as popular as Memphis.

With MHP's becoming so popular right now, if the market doesn't drop out, they will be even more popular, and the ever consolidation of the industry, cap rates are compressing because more people are getting into the space that have lower return objectives and are fine with lower returns because they are placing their capital that has historically earned them lower returns than what they are used to based on never investing in this asset class.  

If I may ask, What made you choose an investment in the Bay Area versus other states which seem to be the popular themes on this forum?

That' a popular strategy!

A popular saying, though, is you can name the price as long as I can name the terms. i.e.

One question - what's the difference between smaller providers that deal specifically with Solo 401k vs other popular SDIRA custodians (like UDirect, QuestIRA, EquityTrust)?

Rentals are very popular.