I had the same doubts back in the 80's when % int. rates were double digits. 

Buyer 2 insists on throwing 45% of his income into a monthly ARM floating rate mortgage in 2016 and offers 1.2M.

That is why there are specialty lenders and why many larger community groups have created their own financing arms.

I’m very interested in becoming financially independent and it would be great to have a support system (beyond digital), that we could all rely on together.

The most common reasons for accelerating a loan are if the borrower defaults on the loan or transfers title to another individual without informing the lender.adjustable-rate mortgage (ARM)A mortgage in which the interest changes periodically, according to corresponding fluctuations in an index.

You will want to make sure you arm yourself with the data and prove you gave it to them otherwise a tenant advocate attorney will eat you for lunch.  

If you don't tell him all the reasons you got a screaming deal, then he must assume it was an arms length open market transaction, which in turn will mean the other home appraises low, which may mean it sells for less, which in turn means one of YOUR comps sold for less, which could impact market value of your home should you go to sell or refinance it.I would be selective about what I would share, and I wouldn't lie, but I'd only share information that will, or could, lead to my property selling or appraising for more. 

If you could not pass these stress tests, then you should reevaluate your portfolio.And as @Steve Vaughan stated, risky loans such as balloons, ARM's, commercial, and owner financed loans, called loans, etc. really throws a big risky monkey wrench into the overall equations.  

I'm sure that some of my positions will go bust, but I'm also sure that some of them will grow a lot and provide quadruple digit total returns in the long term as the Cannabis industry moves more into the mainstream.

If you combine that with a closing arm then the doors will always be locked unless somebody with a key opens it or somebody opens from the inside and decides to prop it open.