If you are looking for a pedal only longtail I would look for used ones. They don't seem to sell that well as new ebike versions. In my larger vicinity area there have been a few for sale in the $400-$600 without any takers. Yuba, Mongoose and few non brands. There was even an original Bakfiets for $800 which finally sold after weeks of being posted. Not a longtail but a long box front loader.
And I love my Travoy as well. I just don't like their prices for their bags. There is a company in Gemany which offers cheaper folding boxes for the Travoy but they don't sell them here in the USA. I had a set sent to my family in Germany and will pick them up later this year when traveling over there. But otherwise the Travoy is a great trailer. I use mine as a trolley inside the store.