Furrion 2- 30A M to 1- 50A F Y adapter
This adapter is in like new condition. It allows you to connect to 2 30A or 1 30A and 1 15A connection to give additional amperage capacity to a 50A rig when 50A service is not available. You'll need a 15A male to 30A female adapter to run one leg on 15A service. These can be purchased for less than $5 at many places- often WalMart even keeps them in stock.
$30 for the adapter plus USPS Flat Rate Priority Mail shipping of $13.45 to anywhere in the continental US.