I agree, and I was expecting a huge tc with the Sienna but it is very surprising.
According to a quick Google search, the current Sienna has a tc of 36.8',
the Quest 40' even,
Dodge Grand Caravan 39.4',
Pontiac Montana LWB 37.4',
Kia Sedona 41.0',
Honda Odyssey 36.7'
2002 Nissan Pathfinder the tc is 37.4'