The space recently became available, and I have received numerous people wanting to rent this space with an RV but sleep in the RV as well.

Neither bank didn't provide any explanation of what terms I and my loan didn't pass. 

Over the past six months, numerous people talked and fantasized about all of the discounted deals that they planned to scoop up in multifamily.

Personally, I continue to flip and have numerous clients doing them as well.

There is a cabin on the property that can accommodate additional 6-10 guests but the current owner has chosen not to rent this cabin despite the numerous requests.

I've helped numerous clients find STRs.

I also would not budget more for CapEx per @James Carlson's explanation.

There are plausible explanations for the tenant's absence.

If you purchased a second home in an a state like Florida on the East Coast, there is a reasonable explanation to buy on the West Coast or Jacksonville and then Cape Coral (Distance is key) but you need a reasonable explanation. 

The fact that you travel for line work could satisfy a the UW's concerns or supply a letter of explanation.