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R+M Load or packster, 60cm or 80cm, Bullitt (is 70cm so in between those sizes), Douze, Urban Arrow family, raleigh stride (babboe and all the other ones that are the same bike), Cube? Triobike also now a valid choice to be fair.
2 + 5 will fit all of those. In 3 years time though your 5 + 8 year old are going to have a lot more leg, by that time a long tail might suit them better, or just get a tag bike and have the older kid ride their own (tethered or un-tethered depending on situation). The upper tier Shimano/Brose/Bosch motors will all happily shift that kind of weight. One 500wh battery will be enough, I wouldn't really bother paying the extra for a 2 battery setup unless you get an ex demo/used deal on one, just buy the extra battery after a few months if you feel you actually need it.
Favourite kid carrying cargo bike? Needs to fit a 2yo & a 5 yo. They are getting too big for our trailer (which will prob be on sale here once cargo bike is acquired)
Hard requirements:
We've tried the Raleigh Stride 2, Urban Arrow, and Tern GSD. (Also tried a Nihola trike and hated the handling.) While the long tail one was more fun to ride, we think the box will suit us better. Liked the Stride a little better, which is handy as it works out a fair bit cheaper if you spec the UA with the cargo line motor to match the Stride. Bullitt looks pretty ace, but its spendy.
That said, we are going to sell the car after our summer holiday...