As to your question about the mortgage, you'll want to research something called a "due on transfer" clause to determine if that is an issue for you.These are all things you will want to discuss with your attorney and CPA.

The issue is tech savvy customers have figured out how to scam it and I can’t get satisfaction from their customer support.

We are thinking of doing something like that but wondering if the people will have issues with who spends most.

The credit card thing has never been an issue until recently, when I needed to rent a car in the next (very remote) town over.

Plumber mentioned there is a ejector/grinder pump in one of the units that handles all sewage from all 4 units.They replaced the ejector pump and in 2 weeks, same issue happened with the sewage leaking in the garage.

Had a similar issue once with a hot tub and I installed multiple shade sails to block the view ... people are crazy

Any tips on dealing with these issues.

I also would add that even with all of that you can have issues with a tenant.

It is not an issue if you are adding more square feet for your personal preference, but I would not expect an ARV that is as high. 

Min loan size may also be an issue at 70% LTV.