I can't speak as to every truck manufacturer, but I can speak as to the specs right from SI2000(GM repair information provided to GM techs) on model years 2007 through 2012 there is no difference between the brake components on a 2500HD 4x4 and a 3500HD 4x4 SRW. In thoery, these should stop identically as long as you are comparing the same cab/box configuration. As I said in earlier posts, there is definately a difference in stability on a duelly vs SRW. In 2008 there is an increase of 1,200# in max. trailer weight and 0 increase in GCVW comparing the same cab/box configuration 2500HD/3500HD 4x4. Using GM information again, that only increases pin weight spec by 300#. There is not enough gain IMO to warrant going SRW and short box. Step up to a LONG box, which is what you HAVE to do to get a duelly, there is a large difference-22,500 max. trailer weight and 30,500 GCVW. Keeping in mind these trucks all have the same brake components at the wheels, the difference as I stated earlier is in the springs, frame and duel wheels. Stopping should be the same. As for controlling the beasts that we are all towing, remember there is 12,000 to 16,000 pounds BEHIND roughly 8,000 pounds for most of us. If any of us are expecting to control that "when things go bad", we are in for a surprise because you can't stop physics!
Marty originally asked for opinions whether he had enough truck. He certainly got some. Ultimately, he has to decide what he is comfortable with. If everyone remembers what is behind them ,what it takes to stop safely and leave more than adequate room between you and the next vehicle and as Rich said "drive accordingly", we should all arrive safe at journey's end.
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