eBike technology explained

Hey everyone!

I've been doing a lot of hauling lately with my RadWagon 4 – groceries, kids, even some lumber for a DIY project – and it got me thinking about the tech behind these beasts. Specifically, for cargo eBikes, what are the key technological differences that make some so much better for heavy loads or hilly terrain? Is it mostly about motor torque and battery capacity, or are there other components like controllers or even frame geometry that play a huge role in performance and longevity when you're regularly pushing 300+ lbs? Would love to hear your thoughts and experiences!