That's a hard one to call, sdog. The quality will be evident as you compare to your Jayco. Compare the frame, insulation, slide mechanics. What about the little things like the hardware for the drawers, interior woodwork, etc?
I have only stepped into a Grey Wolf and was not paying enough attention to compare, but I think this is something you can do well since you already have the Jayco.
If it helps, from what I have heard on a number of boards, I agree with bikendan that the Grey Wolf is considered to be a line that is of lesser quality. But then they are also more economical IMO.
What was your opinion as you inspected the trailer?