It's only been a week, but what are my options if they do not return and the RV just sits in the slot? 

There's a lot of options to consider. 

The contract says no one else besides them can be there for over a week so it is my choice,  what options should I consider for this, a rent increase per child, security deposit increased. 

Still, wearing a bee-keeping suit would still be the best option.    

I will explore all those options.

There are several other Skip Tracing companies with flexible spending options, no high-cost monthly commitments.

I’d rather pass this problem off & keep shopping options. 

Subsequently, I went to Peoples United Bank and got a 4.5% commercial loan with a 25 year amortization, 10 year balloon with a one time renewal option. 

Make sure if you go into a contract (no option period), you require a substantial earnest money.

I have about 40k cash but was looking for financing options