There's no one size fits all of course, but generally the STR/MTR/LTR mix in a multi-family unit can be challenging because the way renters utilize these properties is so different.

Some properties there's just a Brita water pitcher the cleaners fill, others it could be bottled water cold in the fridge, and others would provide nothing because in all reality guests bring the drinks they want.

Stop hanging out with your deadbeat buddies who spend all day drinking, talking sports, and otherwise wasting away.

Given your experience with RV parks and MHPs, you already have a strong foundation for managing mixed-income streams, which will be valuable here. 

Let's assume this person also drinks the Grant Cardone Kool-Aid and wants to 10x.

Stop hanging out with your deadbeat buddies who spend all day drinking, talking sports, and otherwise wasting away.

I've been caught in my PJs, chasing my kids around in the front yard, drinking with a neighbor, etc.  

Just wanted to avoid mixing family and business  

These markets offer a great mix of affordability, strong rental demand, and steady appreciation.

For an extra charge, the cleaners may be willing to do with laundry at their home, although I did this once and had mixed results.