Before I purchase an insurance policy I wanted to seek some guidance on the best way to proceed.I received 1 quote so far for a HO3 policy that has 600k+ of dwelling coverage, 70k of additional structure, 450k personal property, 200k loss of use, 500k liability, and a few extras like equipment breakdown, water backup, service line.

Thank you all Generally self storage is considered "Rental Income" unless there is some substantial services involved. 

Hopefully this type of loan helps me out.

Check out the guys Miliraty to Millionaire (https://www.frommilitarytomillionaire.com/)They have great content on their website and podcast for service members growing their wealth through REI. 

Make sure to connect with a real estate attorney who actually does this type of PML investing as part of their practice so you know what you can and cannot do.

Does anyone know of any specific banks/institutions that will provide this service/are there any other strategies that I could use to obtain financing?

Such a product/service doesn't exist, as far as I know.

What made you interested in investing in this type of deal?

I recently moved back to Maine from Georgia after completing my military service.

The state gives them a paper license that they put on the back of their jacket with a pin, and then they take a sniper type rifle with a scope and they go out in he woods and they shoot the deer.