Aosom Bike Trailer, Foldable Bicycle Trailer with16 Inch Pneumatic Tire, Universal Coupler, Frame and Safe Reflectors Design, Large Load Capacity, Black

I use one the one linked below. It's been very durable after being used many miles every day to carry a dog in a home-built enclosure. The dog hutch can easily be swapped for a cargo bin when that need arises. Regarding the "axle too short" issue, I use the hitch shown below and turn the axle nut around so the flange is on the outside (distal end) and the nut can seat fully in the hole through the hitch flange. The hitch that came with the trailer had a hole too small to fit over the axle, probably because it was sized for a non-ebike. Trailer: https://www.amazon.com/dp/B0083JHEG8 Hitch: https://www.amazon.com/dp/B08FRQCPJX