You can get the plugs and adapters at Wally World also.
Don't forget "blocking diodes" for your toad. This will prevent any feedback to the coach.
Lastly be aware that most 7 blade receptacles combine the turn ans brake lights on the same pin. So, if you have separate turn and stop lights on you toad wiring can get complex.
Here is want Newmar provides. Be aware that pins 2, 4, and 7 are run from the dash area to the receptacle but are NOT connected to any power source. The owner can use them as they see fit.