Keep in mind, that is only a 120v charger, so even though it will support 50amp of 120v, you will only get the same charge speed as a home 120v 15amp circuit (1,600watts); not the speed of a 240v (3,200watts). You probably know that already, but mentioning it for other readers.
Still, campground plugs are a handy source of power.
Edit: This comment is incorrect. Was thinking TT-30R vs 14-50R outlets. See further conversation below.