The 4500 does have air ride seats for 05. If you order air ride seats, there are no airbags. If you want airbags, then you have no air ride seats. I have them in the truck. Gearing is low. There is an overdrive off switch on the dash. My TH 5'er is 20K.

The one beef I have with it is the speed limiter. 75mph max. A few pics of the truck http://jan.ucc.nau.edu/~mr/4500/