I had the same problem and I did the following to get the steering under control.
1. Check all tire pressures and assure that they are pressured to the value located on the tag located just below the operator's window. Assure that the pressures are all the same. Tire pressure differences, of only a few pounds of pressure, can make a big difference on how your coach handles. I check my tire pressure often and before each trip.
2. Check the wheel alignment and wheel balance. You'll discover that this usually requires a trip to a good tire shop like Goodyear. Bad wheel balance can make the wheel "hop" at different speeds and the toe-in can make handling erratic. I cannot stress the importance of the first two steps. I discovered that my RV's toe-in alignment was out by 3/4 of an inch and that my RV's tire pressures were all different with differences exceeding 20 psi. What a surprise I got!
3. Have the mechanic increase the loading on the existing front sway-bar. This does not affect your coaches warrantee and really helps with handling.
4. I installed a Steering control module manufactured by Safe-T-Plus. Their website is
Safe-T-Plus - The Steering Control Specialists | Helping motorists' vehicles steer safer, less, and with peace of mind.. Installing the steering control module really helped with preventing the wind from blowing me all over the road.
Since I have completed the above steps I can honestly say that the RV has become (almost) fun to drive. We have taken some long trips and the coach will still rattle badly when I encounter rough road surfaces.
I plan to add air bags to lessen the rattle. Then I plan to add a sway bar to the rear axial to stop the rear of the coach from swinging badly when traversing from one surface which is not level to another surface which is level such as from a parking area to the road.
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