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buying a cargo bike for kids is such a weird experience, its the most money you will spend on a bike (arguably) yet a test ride doesent really hold any value unless you can rent one for a week or so and see how the kids react.
There are some shops who do long term rentals/longer test rides worth looking at IMO. My kid started being in cargo (in a car seat) at 4 months old and 4 months since then she LOVES it.
Motor/eAssist is essential with two kids IMO.
Could be the flaw in the plan
Do you have to do the canopy, or can you do sideboards, baseboard and seat with kids?