Having a ~3000 lb trailer is a necessity for my wife's business. A lighter one likely would not have all the things that she needs.
Strangely enough, there was a Prius Prime at the dealership here. It looked nice, but there were two things I really hated about it: the horrible white interior and there was hardly enough room in the back for half a week's worth of groceries! Other than that, I am sure that it is a great car.
I suppose that the 2500 lb tow capacity on the Rav4 Prime is not really a limit then. I think I can just install a larger transmission cooler and be just fine with a 3000 lb trailer!