Checkout some of the great Vrbo tools like market maker.You can see demand, occupancy of your competition for certain dates.The boost function can move you up in the search results for certain dates and it will also show you where you are in the search results for any dates you choose.I get most of my bookings from Vrbo and people always find me on there.

Once you have a shortlist, sign up for an account with each one and test them extensively to see how they function.

The original lease from the owner who owned it at the time it was installed had hand writing on it for payments that increased per 5 year term is what it looked like if I recall correctly.

Am I still able to write an offer the buyer would be interested in?

I gave him until the end of the week (as per this writing: Tomorrow) to give me an update.  

Given the 48 hours to decide and get it in writing. 

I am starting a new journey in the mobile home niche I eventually want to write my own notes (shout out to lonnie) but would like to gather cash and I feel the best step to this is to do wholesaling.

Unless you have something explicit in writing that they permit you to move forward, I'd hold off.Consult with counsel.

Our practice has been to write a lease for their contract dates (typically 12 weeks).

However, when they don't offer it or they offer something that is less than the Buyer's agent charges then the Buyer can just write in the offer that the Seller is to pay "x commission" to the buyer's agent.