It sounds like you need a cargo bike. It just so happens that Moustache has made a very capable cargo bike and it just so happens that I have made a video of it. So for someone who needs more of everything watch this: Best Cargo ebike: Moustache Lundi 20 ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-oTfvhkjS-Ro.html