This is going to sound crazy, but consider getting the Wall Connector - now let me explain.
The mobile connector is $200 (if it does not come with your car) and you may need to swap out the breakert for a GFIC breaker, say $35-$45, and some sort of cable management system for say another $35, this totals $270 or so, the wall connector at $400 which is $130 more and is available today. Also, while that 120v 15-amp circuit meets your needs today what about the future? The wall connector supports circuits of 15, 20, 30, 40, 50 and 60 amps. Adding a 14-50 outlet later will run you $50-$80 for the outlet, $100-150 for a GFIC breaker and another $45 for the 14-50 adapter, at which point your total cost for the outlet and mobile connector is more than a wall connector.
Just offered for your consideration.