I mean, for me they effectively replace the car. We own one, but since we have the e-bike, I don't drive at all. I use the trailer for shopping if needed. And yes, we used the trailer + the small seat behind my seat. Basically all three kids could ride with me, but the battery depletes fast and I am not sure about the general strain put on the bike's structure with so much weight. The bike is not technically ours but leased from the company my wife works at. In Belgium, at some point the taxes get so high that people choose untaxed benefits at work (like a bike leasing or vouchers, even a company car) instead of salary hikes. We now own a second e-bike with two separate seats so we can have family trips. We'll see how it works. To clarify: I do NOT believe that you can always replace a car with an e-bike. But in the rather wealthy area where we live, the bike infrastructure is great and everything is very walkable, so it is possible to greatly reduce your reliance on cars. The Netherlands are far superior to Belgium in this respect.