We seem to have the same history with coaches. My signature coach is my first diesel and first air ride suspension. All previous coaches were gas.
The short answer to your question is yes, a steering stablizer will keep the front wheels straight. If you do this right away, the problem will be masked by the stablizer. The problem has not been corrected.
My comments assume the chassis shop approved all your front end parts as working normally. And they are in good shape, not worn out. If you have a straight front axle there are many choices for a steering stablizer. If you have an independent front suspension (IFS) there is only one choice. Go here
to read about them. The best thing to do is call SuperSteer. Discuss your situation and seee what they say. For me, the most important feature of a steering stablizer is the ability to re-center the stablizer when conditions call for it. This makes driving in strong side winds or a high road crown, all day, much less tiring.
On the Super Steer site you will see several products that can help with the wantering. Some have nothing to do with the actual steering of the coach. This is what I did:
1. Installed a steering stablizer. It corrected the wandering problem immediately. Unfortunately, I had to run the stablizer at full pressure of 180 PSI. Within 2 years the device broke. I have repaired the stablizer and it is now working again.
2. A track bar was already on the rear end.
3. I installed an IPD (now Roadmaster) anti sway bar in the rear of the coach.
4. Installed SuperSteer Motion Control Devices. Go here
to read about the product. After installing this product I can run my steering satablizer at 100 PSI. It should now last a "lifetime".
The bottom line in favor of installing all these items is that I am trying to minimize the weight shift that occurs when the coach is hit with a side push. If I can minimize the weight shift, then I can minimize the front tires following the coach weight. Of all the above mentioned products, the Super Steer Motion Control Devices made the most dramatic impact. I took a 550 mile trip with the steering stablizer turned off and found the coach steering to be satisfactory. Without the Motion Control Devices, I would not have been able to do this. The steering stablizer is the #2 product of importance. The benefit I receive is being able to return to one finger driving, in a crosswind, because I can re-center the stablizer to compensate for the wind. The antisway bar greatly helped keep the back end put when a side push is given to the coach. Remember we have both a front and back end to think about.
Good luck in your search. Let us know if any additional information is needed.