Kid hauling continued...
My little stoker was in a Chariot trailer from age 1-5; Hamax Caress rear seat from 2-4; Weehoo Turbo trailer 3-6; and tandem stoker from 5 to 10 (and counting).
For the Chariot, we had all the accessories for skiing, biking, and running. Winter fatbiking with the ski trailer is a cherished memory from those first few years. The trailer was great for keeping the kiddo warm during cooler months. Our trailer didn't have suspension, but it would've been a nice upgrade.
The Hamax Caress was awesome for portability, kid comfort during warmer months, and on-bike speed. We never tried a top tube seat setup.
None of us were too crazy about the Weehoo. It was really bulky, heavy, and slow compared to the tandem or single bike with rear seat. Towing the Weehoo behind our tandem was a great way to keep the family together, though.
Our tandem is a custom Chinook all-road tandem with huge range of stoker seat heights, crank lengths, and bar positions. We've used it for school commuting most days from kindergarten to 5th grade.