I'm a bit of a bike nerd (very involved with my local bike community), and I'll throw my vote behind something with a Bosch motor. Every bike mechanic I know says go with Bosch or don't bother (or, I suppose, get very, very good at fixing things... which I guess is a permie trait, but these motors can be pretty complicated, and often need serious specialized tools!).
Personally, I'm saving up for a Gazelle, but they're pricey and also not necessarily what you're looking for.
Have you thought about a bakfiets (box bike)? They're becoming more popular in North America now (originally used in Denmark and the Netherlands), and are great at hauling all sorts of things. They can be expensive though (if you want to see some beautiful bicycles, take a look at the Riese & Müller Packsters... so much money, but so spectacular). Consider this 2020 list of top cargo bikes, and see how many have Bosch mid drive motors:
https://www.bicycling.com/bikes-gear/a25054215/best-cargo-bikes/ .
Shimano has also been having some issues lately with their motor, and their customer service options can be more difficult to access (most modern bike shops, at least here in Canada, are certified to support bosch motors).
I promise, I have no affiliation whatsoever with Bosch, other than loving good, reliable bikes!
Also, Bikes at Work makes the kind of trailer you'd likely want to haul permie things:
https://www.bikesatwork.com/ 
. Our local bike valet hauls bike racks on them, and they are seriously heavy duty trailers with one of the best hitch attachments I've ever seen. They can hold far more weight than you're likely willing to pull.