Have been on holiday with children and dog recently. We often get asked about how strong the wishbone rear ends we often use are, and whether than can withstand heavier riders or luggage. I have now put in around 1000 miles with our skinniest diameter. thinnest wall thickness wishbone, almost all of this with both a child and myself plus 10-15kg of luggage, and can say catagorically that the bike has not caught on fire once. Or bent. Or wobbled dangerously under load at speed. So there you go!
This is also likely to be the last outing for my elodest daughters balance bike, she has outgrown it, and is demanding pedals.