From Duluth to Lutsen is only 92 miles. I am going to Caribou Highlands very soon too, I'm just going to look for a 110v outlet, I'll be there 3 days, should net about 50 miles per day (I won't be plugged in the whole time and will drive some). I am not worried about it at all. If I need 50 amps, I can get it in Grand Marais, or even more at Bearskin. I plan on driving the Gunflint, or part of it, the Fall colors should be amazing and there is no better place to see the color than the Gunflint Trail.
I can always stop at Grand Superior for some charge on the way back to the Duluth Supercharger if need be also.