DSTs function as investment vehicles that hold ownership of income-generating properties, granting investors fractional ownership in various types of commercial real estate such as apartments, self-storage facilities, build-for-rent properties, and NNN (triple net lease) properties.

If you have the storage room, having one of these might be handy for future SC summers, as I'm sure this will happen again at some point.

That said, I do want to respectfully offer some counterpoints to Dan's assessment that may provide a broader perspective on the value and feasibility of ADUs.1-2.

If moving is not something feasible for you to use it, there are other ways to get started.

Has anyone ever used conex / shipping containers as mini storage?

If the seller is offering zero compensation, that property could be out of budget from inception or drastically reduce the seller's potential buying pool as initially it might appear out of the buyer's budget or feasibility if required to compensate their side directly. 

Time will tell if that is feasible for me.

There are 51 storage units on the same property.

Before taking any action, I'd like to research whether this model is truly profitable and feasible.

I could also leave a unit within the multifamily property vacant when I am abroad to use for storage if needed, to better help solidify the "primary residence" requirement.This is a pretty specific question, so I haven't been able to find any previous posts on it or any helpful literature online.