I'm in the early planning stages of a 2018 trip from Northern Calif to Quebec City, then south into Maine. Crazy idea, but at 73 I need challenges and Maine is one of two states I haven't visited. North Dakota is the other and may try and snag that on the way back west.I just completed Canada! I'm fairly sure I'm the only one to have charged at all 28 superchargers in Canada. Of course that will change when Levis and/or Brossard go live.
Charging at every live supercharger in the US will be impossible since by the time I finish one part of the country, new ones open up on the other side of the country, so no, that isn't my explicit goal as it wouldn't be possible