Here is a little video I made of Sunday's ride. I have ridden the Qball with the Adams Tandem Trail-a-Bike before but I don't remember it being this creaky. I think it might be due to the weight of one of the riders.
Load rating: 125 lb (56.8 kg)
For ages 4-6
Here are specs from Adam's website and I think the weight of my two boys is probably hitting the max load capacity of the bike. Still, want to see how it does on the Burley Tandem but this might be it for the Tandem Trail-a-Bike: