The best hope is that you take your Sterling to a Dual (or Tri) brand dealer like Knoxville Freightliner or Team Truck (Ontario). At least they have an incentive to keep you happy so when it comes time to trade the Sterling in you might buy a Freightliner.
The Sterling dealer here in Kitchener is quite PO'd. He had really turned a lot of people on to the brand in the last 2 years, especially the local townships and cities.