I couldn't find much information about them online besides their own blog posts and a few interviews with the founders, who were promoting MHP business and themselves. 

There are more details here if interested.I will not tell anyone to do or not to, that is a choice that you will have to make and also it is a choice to work it or not, like any system.

Focus on identifying promising neighborhoods in the north or east bay by leveraging your husband’s contractor network, local real estate agents, and online deal-finding platforms.

No.But you do see their website online, right?

They may be regulated, they maybe aren't.A Credit Union is a good choice for funding.

If you decide to revisit STRs, you might want to explore properties where you can project expenses independently, such as using local STR forums or online tools to estimate maintenance, management, and occupancy costs.For networking and strategy-building, you might find local meetups or groups beneficial.

The only 110v dryers I see online are small portable units.

They cover the counties with online access to public records (over 2200 counties). 

Since the last time I was online, I have grown the investing to fix and flipping and a portfolio of 4 properties that are producing passive income.  

The total cost for this monthly for me is $1.00 fee for online payment for Sevier County, TN and the .73 cent stamp for Blount County, TN.