Agree with others that the steering on your Class A should be as good, if not better than your truck was. I would look into having the coach weighed (four corners, not just each axle) to check the load is distributed evenly. Second thing I would try is checking the tire pressure is in line with the weight. After that if you haven't seen enough improvement, I would have the front end alignment checked either by the dealer or a place like Josam's in Orlando that specializes in that sort of problem - http://www.josamusa.com/