Not quite sure how this 65 year old body does it. Maybe it's nothing significant. From pretty much a standing start, yesterday was 30 miles and today was another 30. my knees are bothering me a bit. unlike my Sprint to Standing Rock from North Carolina, this time I am using the vehicle as a bike assisted by the Sun. I'm really quite amazed and delighted. In addition to me there is a 250 pound payload, the vehicle and what I carry. I'm amazed that on gentle terrain such as this part of the country traveling at 9 miles an hour on a overcast, zero Sun, day like today, I leave with a full battery and I arrive with a full battery. I'm doing about half the work according to my torque sensor, About 15 watt per mile, and the Sun and motor are doing about the same. 5 solar panels, 500 watts , is just about right. On sunny days it will provide enough energy that instead of averaging 9 miles an hour I can stay battery neutral at probably 12 miles an hour. I was a bit worried about carrying a 4th panel on the trailer because that made it longer but so far my concern seems to be unfounded. the strong suggestion from me is that others need to start pulling solar trailers behind their electrified bicycles to encourage renewable energy for others and for the fun of it.