Our 2005 Chinook on the E350 chassis had flexsteel seats for driver and passenger. The passenger seat also had a swivel base (aftermarket). Folks with the Chinooks on the 450 chassis (Glacier and Summit) had the same seats as well. To swivel, you have to get a narrower front console that can be found on EBay and elsewhere. Shop4seats.com carries the base.
I thought that they were very comfortable seats.
I installed a passenger seat swivel on my Winnebago view (sprinter chassis). It's nice to have the added seating.
History: '08 View, '05 Chinook, '01 Jamboree 24D, '78 Apache Popup, 81 Komfort Tlr,
84 Mazda B2000 'w canopy,
Tent from wedding shower in '96