Slim M-Series) and will be installing 2 more this year.  

My experience was that finding properties that we could make a profit on were slim.

I just have a certain type I like in certain areas, and the wholesale market for em in this area is slim.

Even that seems like such a slim margin given the amount of risk and capital.

The end result, in attempt to avoid the (slim) possibility of the due-on-sale clause being triggered as you mention, was I left them out of an LLC and just got the umbrella insurance policy.

And then I would second @Kurt Jones you are working with very slim margins and all the uncertainty I mentioned can eat that up quickly.

Slim margins even though ROI is good.

That said, your margins are already very slim after taking realtor fee's, holding fee's, overages and capital gains taxes. 

When you transfer the property, the bank has the right to call your note due, but the likelihood of that happening (assuming you are making your payment on time, etc.) is slim to none.

We come across duplex's often, but above that it is pretty slim.