Scary Handling Problem

I thought "tight steering box" from a comment earlier in this thread. There's an adjustment screw with lock nut on the top of the steering box. It can be used (sparingly!!!) to reduce free play in the steering wheel. But if it's set too tight, the steering won't want to return to center. You'll also have to force it off of center. Having to force the steering will result in exaggerated steering response. But in ordinary conditions, I wouldn't expect a steering box to wear enough to persuade anybody to tighten it much before 100,000 miles.
Have you owned this coach all along? If you just got it used, I wonder if somebody else had the Scary Handling Problem and tinkered with the steering but never found the real problem.