Personally, I love KW and the Pete. They're similar anymore interior wise since the 579 and 680 are essentially sister vehicles. The layout in the Cascadia is a little better regarding storage but the KW just rides better and has a better feeling in the road IMO.
The Cascadia has a superior turning radius and more room in cab and sleeper.
The T680 IMHO is much smoother at shifting and accelerating.
I started out with a T680 with my first company and now I'm in a Cascadia. Overall both are good trucks but I'm partial to the 680.
KW has better hood latches, driver's seat memory switch, better ride, thicker steering wheel, better interior lighting. Cascadia has better steering radius, windshield curtains. My Cascadia is an auto shift so it's pretty smooth ;)
I just had to switch from a 680 to a Cascadia. I miss my KW. The differences are all in the details, as Rob lists.
I feel the 680 is better thought out in those details than the Cascadia.
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Long story short, I had to take some medical leave, and had to turn my truck in several weeks ago. After going through re-orientation this week, I've been assigned to my new house, a 2013 KW T680.
I've never driven a KW before. I had an Intertrashional Failstar for ~10 months back in 2011, and have been driving Cascadias ever since.
Interior storage differences aside (I'm going to have to get a bit more creative in which where I put my what), anybody who's driven both care to chime in on any major differences between the two trucks? Ride quality, road noise, turning and/or backing radius...especially turning and/or backing radius. And of course any other differences you might think of.
It sounds silly, but after driving Cascadias for so long, I'm hesitant to drive a different make and model. Maybe I'm just getting old and crotchety and GET OFF MY LAWN.