I would think that larger vehicles should be easier, because their volumes grows at a cubic rate with size, while energy requirements only grow at ^2 (because t

I would think that larger vehicles should be easier, because their volumes grows at a cubic rate with size, while energy requirements only grow at ^2 (because the latter depends mostly on the wind resistance, which is a function of the front-facing area). But I remember reading that Elon Musk decided against electric trucks because the numbers just wouldn't work out. But maybe that had to do with the much higher weight of a loaded truck, whereas a camper is more similar to a really large car.