I have the ability to generate a list of Landlords in my area, Are there template mail letters/post cards that we can use to get started

But if you buy into the idea that it takes multiple touches to get a lead contact you, then it is FAR less expensive to do this on FB than it is using an endless stream of postcards.  

Not an expert in that niche at all, but I'd suggest driving for dollars in the various parks and then marketing specifically to the distressed mobile homes (postcards, texts, cold calling, etc). 

@Eric P.We let our guests know that we accept direct bookings in several ways: post-stay text and email follow-up, post cards and business cards displayed in all our properties, giving each property a unique name and promoting it on social media and elsewhere so guests can do a quick Google search on our property name and we appear everywhere.Increasingly, we are seeing even some first-time guests seeing our property name on the big listing sites, then finding us with a Google search and booking directly on their first stay.

I want to put the list together so that I can start to send out some postcards !!!!

I had really strong response rates with postcards, but the deal size (wholesaling) was pretty thin.

@Terry BurgerI received a post card from "nice guys buying houses" regarding a rental property that i own. 

Send Direct Marketing targeted towards the people in areas where most owners should have mostly a majority of the market value, an area that has 30 to 40 year old houses.Either mail them in a special envelope or colorful postcard or knock on their entry door and ask them if they want to sell. 

Maybe buy a list and send postcards.

I sent probably 100,000 postcards this year and bought and kept exactly 2 houses.