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This, forks often go south when faced with hard use, work fine for family use though (folk tend not to put 200kg and ram them into things so much as commercial use do).
GSD I've seen my fair share of good and bad examples (several with a literal hole in the frame, weld/burn't through, bent back ends, motor mounts not where the motor mount holes are, brake mounts so badly welded on that needed to 'adjust' them with large tools), even though, they genuinely fit everyone, the mad seat tube angle and very adjustable bar/stem comb means 4'11 to 6'2 fit fine and handle fine for folk who are not used to a cargo bike.
Benno is a nicer bike from a riders perspective and in terms of neat details/quality of parts fitted (sell them too so am likely biased), but would suggest 5'1 is the min rider size in the real world (get the low top tube version). Benno accesories look equal in photos/spec, but in reality the Benno racks are far nicer made if your a welding perv, same for the kids rear seat pads think they are made from Sorbaphane so very comfy and long lasting, vs the Tern offering which is a thin piece of average grade foam wrapped in vinyl, backed with cardboard that will not last past 2 years.
Rode a gsd 2 years back, good bike but the new one is fugly and suspension is expensive / not required etc.
The Benno is a far nicer looking bike, the bigger wheels make for a better ride too.
Gsd would do the job, but we both thought this was a better spec / build. Plus aesthetics are worlds apart.