Mopower58
Unburdened by what has been!
Lifetime Member
Supporting Member
I think the 12v has rear drums verses rear disc on the later models.Our 07 3500 SRW Dodge handles a 700-4 on truck and 27' camper behind it quite nicely. Handles better with the trailer on, as it is sitting on the overload/helper springs. With just the 700 on the back it is just off the helpers and feels like it bounces off them a bit. We head to the mountains of NH or Maine usually, no less than 200 miles each way.
The 12 valve holds the weight pretty good too but the brakes are not as good as on the 3rd gen.