I kept them because I could get more rent from a unit with a fireplace.  

Deposits from the tenant.Security deposits from the tenant in residential dwelling units shall be deposited in a trust account with a licensed and federally insured depository institution lawfully doing business in this State or the landlord may, at his option, furnish a bond from an insurance company licensed to do business in North Carolina.

Because it equals the total value of the units @ $268,750/unit so something doesn't make sense. 

These include accidents (I recently had 2 units destroyed by fire), natural disasters (I have had two units each hit by 2 hurricanes), property management turn over (they sell or stop being as good, I have experienced both), or turn over of team (I am turning over at handyman and I suspect plumber), or just wear n tear of property (slab leak in poor location, sewer pipes rotted out (one unit this month), roof, foundation issue, etc.).  

If all else fails and we still end up with vacancy during the winter, start to market the unit earlier prior to turnover.

In my opinion the best way to house hack is to purchase a multifamily where you can live in one unit while renting out the rest.

https://www.har.com/content/department/mlsHouston Real Estate Highlights in November, 2024:-Single-family home sales increased 6.0 percent year-over-year;-Days on Market (DOM) for single-family homes went from 48 to 52 days;-Total property sales were up 3.3 percent with 7,750 units sold;-Total dollar volume rose 11.1 percent to $3.1 billion;-The single-family median price was up 1.5 percent to $329,900;-The single-family average price climbed 4.1 percent to $418,903; -Single-family home months of inventory registered a 4.4-months supply, up from 3.5 months last November.

Quote from @John Williams: I recently bought a home that has an attached dwelling unit where Im planning to move in and rent out the main unit.

Fixed income...would container village actually be a cheaper proposition vs lets say a senior living 3-4 story apartment building for the same number of units? 

In other words, if you don't fill your unit in the slow season because you're afraid it will cut into your high season revenue, will the high season revenue more than cover the difference?