I saw this today and I’ve realised I’m on the wrong bike! THIS is what I should have taken. I like trikes anyway, but this hybrid bike, trike and truck is just great. Imagine how much stuff you could get in the back? Maybe even sleep in there? I’ve seen one with a windscreen too.
Being mechanically minded I had to see how it had been made. The bike engine had been turned through 90° in the horizontal plane. The drive sprocket now faces rearwards and has a shaft bolted to it. The shaft drives the wheels through a diff, but there’s also a second gearbox inbetween. It must have 10 or 15 gears and be able to pull some very heavy loads.