Cascade has always enjoyed a spectacular reputation in the US. Probably more so with end users than with dealers. A lot of end users that look to purchase a new truck with an attachment such as a clamp or single double may end up buying a truck brand they weren't at all familiar with but it absolutely had to be equipped with a Cascade clamp.
Another major factor in Cascade's success is their competition has always been much smaller and much weaker.
I am in hopes that one of their competitors is keen enough to realize that most, if not all, non Toyota dealers do not want to support their competition and take hold of this opportunity.
One attachment that we buy more than others are side shifting fork positioners. I will say that Rightline makes a superior unit at a much more attractive price.