Then they pedal, but I think pedaling a bike that weighs 20lbs more because of a battery is onerous. I don’t own an E-bike, so I can’t say for certain on that one, but it should be engineered so that it’s just a bike when it runs out of juice.
I have ridden a bike with a trailer and it’s no more difficult to pedal a bike with a trailer that is loaded with about 70lbs worth of stuff than it is to ride it without the trailer.
Look up e-bikes being sold by Greg Lemond, yes that Greg Lemond.
They are not that heavy a d look really cool