there are many reasons.
approx 1 mpg less in fuel economy iv noticed.
but mainly the reason the OP and myself are asking about SRW is for winter months.
see,the wider the thread,the more the truck will float on top of the snow(we're both up in New England.)
you loose traction with DRW (which is why i find it so odd,most duallies where 2wd these years.)
for snow,you want the skinniest tire you can find for best traction.
running SRW will make a much more enjoyable ride in the winter,if the DRW's for the payload are not needed.
he has a 4wd cab and chassis,and iv got a converted SRW 4wd truck,so we may find our trucks go just fine.however if its as bad as i think it will be,i'll be running SRW for winter.
neither of us have driven our duallies in snow yet.so we want to know the best and easiest way to run SRW temporarily.
the OP has contemplated SRW and stock bed in the past,so he may be looking to convert SRW for good eventually.
though iv tried to convince him the 4wd C&C's like that shouldn't be altered.rather sold to someone who needs the setup.kinda be a shame to see a 4wd dually converted into a standard pickup that can be found everywhere much cheaper than his rig.
anyway,its all about traction.he's got a snow plow,and i'm looking into getting one too(please hold up for me D50!
i really do not want a D60 if i can help it,but that's another story.)pushing snow with DRW isn't gunna be easy i wouldn't think lol.