The reality is that you will not find that in the seller finance space, and even if you do, there will be virtually no discount. 

They are listed at market value, but I made a discounted offer to purchase a few of them.- I prioritize building strong, professional relationships with my buyers by taking the time to understand their needs and goals.

You can go straight down on one block and straight up around the corner.

With your primary residence, things can be pretty straight forward in terms of splitting mortgage interest, real estate taxes etc. on your returns.If you go into a rental property, there are a lot of considerations to think about.

I will say that even though you get the boost from VRBO and AirBNB, the first year of operation is usually lean as you build up the rep.Offering a discount on the stay is a way to be more attractive but don't go crazy.

They said they would but wanted the park's balance to be discounted.

Are there issues that you think you should avoid regardless of potential for discount? 

If you already have the buyer and the seller in agreement, you can probably skip the LOI and go straight to a contract.

You won't get a straight answer here since this is a question for a professional that you would normally consult with. 

As a broker in a wholesale market, I "buy" a loan from a lender at a discount and mark it up for my profit.