While I have some touring, but never on an ebike. I did get an ebike for my wife, a Haibike Touring pedal assist bike (ie if you're not pedaling you're not moving, just like a muscle only bike). The hope is that we can do some touring together. She gets about 60 to 70 miles on her 400wh battery. New Haibikes have 500wh batteries and you can purchase other quality ebikes with higher battery capacity. The bigger the battery capacity, the larger the range. Ebikes are heavy, in the 45 to 50 lb range, but a quality ebike can be pedaled without assistance just like a regular bike.
I do think you would probably end up spending more nights in a motel, although many campgrounds have available outlets. It will take a little more planning on your part, but the planning is part of the fun of doing a bike tour.
As far as the "ethical issue", most riders checking out my wife's bike are just interested in how in works. While some people have a difficult time understanding the concept, an ebike, at least a pedal assist ebike, rides just like a regular bike, same gears, same shifting, same braking. The difference is that you feel like you are having one of your really strong days. She has never had any adverse comments about her bike. Frankly, I've never understood the snarky "cheating" comments about ebikes from other riders that I have read about. Riding a bike and going on a bike tour is fun. Really doesn't matter what kind of bike you're riding.