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I don't want to scare you, but please be careful using any fork that isn't cargo approved. The braking loads you can get on a loaded cargo bike with the centre of gravity low behind the front wheel are no joke. It took suspension fork manufacturers quite a long time to develop a fork that could pass the tests. The test forces for a bike like urban arrow are at least 3 times as high as for a normal 20" bike and that's over 100000 fatigue cycles.
talking of Urban Arrows, my front suspension forks were so loose they were knocking. Couldn't find a service/rebuild kit. After much trawling I found original replacement forks, but they were not available & no restock date. They did have a newer version with a through axle but that was about £350! I ended up buying a cheap 20" suspension hub for £70 & I'll keep my fingers crossed. Fitted fine except I had to use a Coke can shim with carbon assembly paste for the steering rod bracket