I'm born and raised in Houston and now work with a full service long-term rental management managing over 300 doors - all SF or MU (up to 4 unit).

On a more enterprise scale, I employ RevMax software as well as a fractional revenue manager who looks at the prices daily on a market level and a comp set level. 

Because there have been such significant gains in the markets this year (unless you are a bond investor😬) fund/asset managers and stock traders will likely do some portfolio rebalancing in January, selling winners, and locking in tremendous 2024 gains.

Decide how much money you would willingly flush down the toilet. 

Property Manager – This is another one I really need help from the bigger pockets community in the local area.

My landlords use Azibo for management and RentSpree for screening, but there are a million options.

However, after renovations, the numbers improve significantly, and the challenge lies in bridging the gap between current and future performance.Expenses typically run at a 30-50% expense ratio for mobile home parks, depending on management and infrastructure conditions.

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'd start by talking to others who are landlords or property managers in your area.  

Oh man- welcome to self management.