All 11 units located adjacent to each other, the deal after stabilization has the ability to net approx. $15,000 a month.

Ability to purchase below market value How did you find this deal and how did you negotiate it?

This is vague and gives you the ability to add your mobile home if you see fit while also jumping on other opportunities if they arise.

We both are drawn to either single family long term rentals, or STR’s in the right locations.Right now we have $20k cash available for immediate investment, with the ability to increase that to $60-70k in the next 3 years through savings and bonuses at our day jobs.

Yes, tax advantages, appreciation - but most importantly: the ability to leverage! 

sounds like a good deal. a couple things of note to hopefully help: SFR w/ ADU is fantastic, you don't want this to be a triplex on paper. do your DD here, and make sure those ADU's are properly permitted as such. if you intend to live in the property you will have to qualify w/ some type of ATR rules (income/ Ability to Repay).

Some of the clients that I work with like the ability to  have an easier time qualifying for business lines of credit, business cards, or other forms of credit that is not specifically a mortgage or real estate related.

It depends on your appetite and financial ability to carry out the post-purchase fight.

The people who will be hurt by this are the people who are wholesaling from other states and the people who don't have the ability to fund a double close. 

Maybe not to this extent but elements of this happens to a newbie and even experienced people probably every few seconds.