This is our 2nd 3500 dually - both were bought to tow 5th wheels. As has been said, the SRW truck in 5th wheel towing applications will invariably run out of GVWR before it runs out of GCWR. That's why duallies are the key for towing heavy 5vers. To illustrate, our 2nd gen 2WD truck is rated at 10,500 GVWR and 21,500 GCWR. Towing our 13,500 lb 5th wheel, we hit the road at 10,380 lbs GVW and 21,180 lbs GCW. Even a 3rd gen SRW 3500 would be over its GVWR in our application.
We've never had any vibration or wheel balance problems on either of our duallies. For our application, it's the only way to go.
(Oh, and it looks COOL, in case that hasn't been mentioned!) Oo.
Rusty
We've never had any vibration or wheel balance problems on either of our duallies. For our application, it's the only way to go.

(Oh, and it looks COOL, in case that hasn't been mentioned!) Oo.
Rusty