Upgrade to a commercial-style stackable setup that can dry faster (30–45 minutes), hopefully fitting in our existing laundry closet without extra electrical work.Any recommendations or specific brand/model suggestions for handling this high-volume, semi-commercial laundry?

Your life style has lead you to this situation and you must change your lifestyle in order to be successful with real estate. 

What is not helpful is the assumption that some responders made that the root cause is the PM's communication style was not to my "liking".

I think the biggest mistake that people make, is thinking that investing in STR´s is some totally different style of real estate. 

Individualized container homes would be ill suited for assisted living style care.

I am in discussions to seller finance a townhome-style quadplex.

This way, if someone feels rejected unfairly, you can show that your decision wasn’t based on any illegal discrimination, but on consistent standards applied to everyone.Alternatively... you could just ghost applicants but that's not always everyone's style lol 

The goal of the first 3 deals will be to target 1-4unit styled homes, requiring minor-rehab.

Rather, they are four former commercial real estate brokers, with one of them also an attorney in their 60s or 70s that have a true hands-on style of mentoring.

You'll likely find it easy to find people who will tell you what you want to hear, but you really need hard facts not speculation.But for some speculation, if you're talking about the Nantahala River or Little Tennessee, sure I think you might be able to do $22K/yr, but not much more, unless perhaps the places are uniquely styled.