There appears to be absolutely no restrictions when it comes to Ebikes - A guy in London has an Etrike and pulls a good sized trailer. Not sure what the combo weighs but it would take out a pedestrian in the blink of an eye. No license no insurance no worries.what about a bicycle, or an e-bike as the tow vehicle?
wind is less of a hazard if you're going slow
less issues with trailer rules, GVWR etc and the law