I'm convinced much of the problem has to do with the driver. When I brought mine home from Florida to Arizona it was white knuckle terror for almost the entire trip. It seemed to lurch from side to side in the lane and require constant correction. As I drove more, even on that trip it got easier. Now, I pretty much one hand it and it's steady. What changed? Me. I learned not to overcorrect on every little movement. It is not a conscious thing, just experience. My advice for those new to the Class A game would be to give it some time before you drop big bucks on chassis mods.
One mod I do recommend - a steering ball, aka suicide knob (no, they are not illegal). It makes maneuvering the beast in tight quarters and right turns and backing so much easier.