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Road riding or tracks and trails?
Either way a decent audible warning device (or playing card in the spokes) is needed so you can warn of your presence before you and your precious cargo slam into some wandering pedestrian or zippy dog lead.
You might consider a decent full length rear mudguard if your not going to have the clear screen in place all the time. It prevents sandblasting your passenger's eyes.
Cycling with a trailer.
What are the hints, tips and tricks I need to know?