Lt Cheg -
I test drove the crew cab trucks and can attest that the ride is slightly better than the extended cab. I believe it has everything to do with the wheel base. Its so long that the normal bumps and potholes are better spaced out. That said, its a long truck, even in a standard bed configuration. I brought one home during a test drive (dealer was close) and parked it in my driveway. It fit fine, but backing out into the street took the whole width of the road, with barely enough room to manuver.
That said, I feel that this truck is very similar in normal driving to my previous truck. Smooth and comfortable with good road feel. However, when the road gets bumpy, there is a huge difference. My old truck would pitch and bounce wildly, as I had Timbrens on the front and add-a-leafs in the back. This new truck stays smooth and straight. Its very confident on the road. Got 230 miles on her already!
Chris - You were right about the tow ratings. Reading the owners manual, my truck has a tow rating of 9500 lbs. Seems like the 3.73 gears are the deciding factor, as the same equipped trucks with 4.10s are all rated at 13,000 lbs. Thats OK for me because I'll never tow that much anyway. A normal expected load will be between 5-8K pounds. And thats probably every couple of years at this point.