I have a 2006 Monaco Diplomat PAQ that I've put 25,000 miles on since I purchased it 4 years ago. Our first trip from California to Iowa involved a lot of white knuckle driving across the windy plains of the mid west. Keeping this coach in its lane, particularly on small country roads, was exhausting to say the least. Trucks passing from the opposite direction were the worst. At the time my coach had new tires but original shocks. I had no free play in the steering. The coach was, for me, undrivable. Each day ended with a cold 6 pack just to settle down. So....... after MUCH reading and pondering the expense I purchased a "ride enhancement kit" from Source Engineering in Eugene, Oregon. It includes sway bars, new shocks and a steering stabilizer. I paid $3470.00 in 2015. A huge investment for me on something that wasn't guaranteed to work. I installed it myself. (Not recommended for the faint of heart). The change in drivability is amazing. These are big boxes and the winds are easily felt in them, but the sway bars really make a difference when its windy. After driving 15,000 miles now I am both relieved and glad I spent the money for this product. Testimonials are always tough, but when I read your post I had to chime in. Source Engineering is easy to contact and perhaps could offer another opinion. It won't be a sales pitch. Like the others though, you should probably start with an alignment. Or you may just have a sloppy steering box. Either way, a wandering coach is a real drag. Good luck to you.
Charles
