You can use the lookup function on my name and Selfstorage.  

For my investor side, I use REI Blackbook because of all the included functionality...you do not have to duct tape together 12 apps with zapier.

The basic function it serves is to provide you with access to the network. 

The HVAC is relatively old, while it is still working, it may stop functioning in some point.

So, yes, you need to the primary insurance, e.g. the homeowner's/landlord policy.While this doesn't "replace" a LLC, it serves a similar function since the insurance is now mitigating your liability risk. 

My first interest here is in seeking advice on purchasing a property that will initially serve dual function as a STR and vacation property for my family.

And this is intriguing to me because in theory the value of a commercial property is a function of the lease more than the property. 

I'm curious about what exactly I need to have in place for the park to function properly.

Rather than spend a lengthy period fighting with the community organization on what should be a reasonable variance request, I would like to satisfy the ground level commercial requirement with a space that has the appearance and would function as a home office (which is how this space would likely be designed and used anyway even if the zoning requirement did not exist).

There are services that allow you to collect online rent payments as well as have the added functionality to help you manage your properties all in one place for free.