Cash flow strictly and only investment is just missing the forest for the trees and one of the worst things you can do.

They schedule leases to end in spring/early summer because they don’t want the vacancy during the winter/holidays. 

Mainly you're responsible for the sewer bill and to provide heat and hot water, but not things like air conditioning.If this was winter, I'd be concerned about pipes freezing if the relationship isn't going well, but a 10 year tenant probably won't let that happen.I don't really know about the downsides of not having a lease. 

We have had guests try and cancel due to smoke from forest fires.

This past winter i signed a tenant for three months with options to extend monthly until spring summer.

There are some exceptions to a lender's ability to accelerate the note if the transfer was done for estate planning purposes although that usually involves a trust, not an LLC (Again, don't listen to me, i'm not a lawyer or CPA). if they do accelerate, you are afforded the right to cure any breach subject to the acceleration so, ok, darn, you got caught...put it back.

I'd say even a large %(like 90%+) of BP miss the forest for the trees. 

Very few people move out of storage in the middle of the winter and all locations around are full. 

Weird…My honeymoon cabin in the Smokies is a great investment, but I didn’t buy at an overhyped price and plan to hold it unless a forest fire or rockslide says otherwise. 

Quote from @Marc Winter: Not sure I understand what you meant:  the TENANT wants to make a deal?