Hi Hoddytoddy,
Okay, its been awhile since my youngest is now 8, but this was our experience with the Burly D'lite for two. Usually we only put one kid at a time in, and brought snacks, sippy cup etc, toys, like mtbdarby said. Always put a helmet on them. Yes I think it was a design flaw and I don't know if they have fixed it but the helmet does push their heads forward a bit. We also put rolled up towels under their butts since they seemed to slide down even with the harness pretty snug. Most of the time my kids fell asleep on rides. Keep the screen down in front since stuff flying off your tires could fly in their face without it. Watch the Temp inside. Okay when you are moving but stopped they can get hot inside if its closed up. We pulled them with road bikes and mtbs. The trail should be fairly wide and hard packed or paved or they are a bear to pull. Have fun and before you know it they are on their own bikes leaving you in the dust.