I would like to add to what DPELLTIER said:
As one that has gone from a 2500 srw to a 3500 Dually, the difference in stability while towing is simply dramatic. With the srw going by a semi in the left lane was an adventure. With the dually, I hardly notice it.
I do not think a mistake was made in purchasing the SRW. It is NOT unsafe to tow with, it is also fully capable of during your job. It will just be a matter of having to be on your toes during crosswinds and bypassing big trucks...
Now, for those that think the dually is a hassle around town: I thought that too until I bought one
Cheers, Bill