Interesting point. My short bakfiets would probably be unrideable at 25kph with more than a banana and me on board.
But if I ever have an excuse I will buy a 45km/h cargo.
If pushed I'd go for the bike with the longest wheelbase and trail and possibly the lowest center of gravity - but I haven't seen any geometry charts for cargo bike with trail figures.
Would have to do test rides, also not a lot of speed cargo around.
Pretty sure the R&M ones, for example, are stable at speed.
And there is the problem that, in Germany at least, you're not allowed to use cycle lanes with a 45kph electric assist bike.
Interesting point. My short bakfiets would probably be unrideable at 25kph with more than a banana and me on board.
But if I ever have an excuse I will buy a 45km/h cargo.