Thank you Karma, what a lovely story.

I tipped the (empty) trailer over today on the way to pick dd up from nursery I ride down a road, then go straight over a dropped kerb to join a shared pedestrian/cycle path. Every day it works like a charm. Except today I had a car sitting alongside the end of the trailer which wouldn't either go past or drop back (it happens a bit, tends to be older couples peering into the trailer). So I took the dropped kerb at a narrower angle than I would normally do as there was no space to move out, and the trailer went onto its side on the pavement (sidewalk). Followed by the woman in the car yelling "Is there anyone in there? Is there anyone in there?" at the trailer before her husband sped off while she was still shouting. I checked the bike and trailer all over, phoned the LBS and checked it all over again, and then rode to nursery and brought small girl back very slowly and carefully. Other than one small rip to the outer cloth and a scuff to the paintwork on the bumper it is fine. I still feel a bit shook up but will learn from this to take a bit more of the road earlier on and to hold my nerve even when people are driving too close. They had ample time and space to pass me, and complete visibility of the road ahead. I'm very grateful that it didn't happen with dd in the trailer.