I have been able to find a couple of options for this setup though, they just require separate leases for each room and sometimes 2-3 months of rental receipts as well. 

However, I am unfamiliar with any lenders having traditional mortgage options for anything with a VIN number such as a trailer.

In other words, an IRR calculation.Have you ever considered doing lease options?

Here are a couple of ways you could structure the deal:Lease Option with Seller Financing: You could lease the property with an option to buy later, allowing you to rehab it while giving the sellers time to find a 1031 replacement property.Seller Financing with Deferred Payment: Structure the seller financing with no immediate payments, allowing you to refinance once the property is appraised, and the sellers can complete the 1031 exchange when ready.Escrow Holdback: Transfer the deed into an escrow account, giving you control without immediate transfer, so the sellers can take their time with the 1031.Third-Party Facilitation: Use a qualified intermediary to hold funds and facilitate the 1031 exchange while you refinance.These options allow flexibility for both you and the sellers.

Master Lease with Option. 

I'm happy to chat about your options to see if we can get you out of this mess. 

That said, if managing sounds overwhelming or you’re strapped for time, hiring a property manager from the start is a perfectly valid option.

IF so then Furnish Finders might be an option for Mid-Term rental.  

Seller was not willing to extend contract or accept creative financing options.

This will either eliminate or open different options for you.3.