Can you even buy an acoustic longtail #CargoBike these days with smaller rear wheel (ideally also with steel frame)? The only one I can find is the Yuba Mundo Lux, which has a 26" rear wheel. Terns and xtracycles are all bosch-equipped (booo proprietary frame!)
I get that covid and tariffs have cratered the US bike market, but surely someone's still out there selling a basic acoustic longtail without a high center-of-gravity.. heck, just the frame if necessary.
