Well, I just drove back from SLC yesterday in 40 mph crosswinds, sure was glad I had my dually. It could have been done with a srw, but why risk it. On the other hand, if you drive accordingly, a srw will be fine. Some questions to ask yourself, what speeds do you drive, mountains versus flat, how is the braking, I'm sure your 11 doesn't have an exhaust brake, unless it's aftermarket, and in general, whats your comfort level.
Ram 3500 DRW, 15' 3805 09 Electra-Glide, Therapy Bike, 79 Electra-Glide, Bar Hopper
Earth first, we'll mine the other planets later.