The guru your son is learning this technique from is likely not telling your son that the deal will almost certainly encourage your son to get an "off-market" deal from a "wholesaler" who is unlikely to properly disclose the details of the property or encourage an inspection. 

DSCR loans are based off of down payment, credit score and either actual or market rents so it helps to supercharge an investor's real estate goals and net worth.

My only tip is to stay on top of the market rents in your area.

I would just be careful hopping back in now as interest rates and low inventory are making it very difficult if you aren't finding your own off-market options to buy.

The newest outdoor is still advertising 1st month free as they haven't filled up, and I spoke with the climate controlled owner/builder yesterday (he's a pretty big REI in the area), and he made it sound like he hadn't leased a single climate controlled unit since they opened a few weeks ago.I recently purchased a 140x45 warehouse with low ceilings and had debated doing self storage, but my market seems very saturated.

Are they off market or on MLS? 

Most of these properties have been sitting on the market for 30+ days.Other possible issues is the hot air furnace is very old.

Good luck and Indianapolis is a great market.

Look at their marketing strategy.

If you're a landlord or investor in the Charlotte area, you might have noticed something unusual in the rental market this winter.