Unfortunately, more mobile home parks are redeveloped into a higher-and-better use every year than are newly constructed.

Start with BiggerPockets Ultimate Beginners Guide (free).

Using leverage to scale, such as borrowing against this cash for larger down payments?

So, this really is a large portion of the tenant population whether its issues like this or others. 

As others have said, the best thing your son can do is run far from this deal, buckle down, save his pennies (he probably already is doing this), house-hack, and improve a property with sweat, hard work, developing a DIY skillset, and self-managing tenants. 

I use this and share with my team (i.e) drone photographers, VAs, reatlors, partners, etc.Zoho Forms, I use this to collect info from leads, buyers, etc.Zoho Desk, this is a ticketing where all inquires go to and since it integrates with Zoho Forms, it creates a ticket within Zoho Desk + New Lead within Zoho.Zoho Cliq, similar to slack, I communicate with my team with this software.

He has helped many real estate investors and really understands the niches in these areas for real estate investments.

Then you can read a more in-depth book like The Book On Rental Property Investing by Brandon Turner or The Unofficial Guide to Real Estate Investing by Spencer Strauss.You need to get a firm grasp on two things: the ways to make money with real estate, and how to find deals that match your goals.P.S.

I used a demo of it, and it seems to do a lot of great things.

This is absolutely correct.