I speculate that Jayco has increased the wheelbase on the newer model because they had to. Common sense has always dictated that a coach with a wheelbase ratio less than .50 will be impossible and unsafe to drive.
I disagree that the addition of aftermarket add on components are the answer. If the wheelbase ratio was close to correct, these aftermarket components can help to improve things and make handling acceptable. I do not believe that any add on components can solve this lack of wheelbase issue.
I also disagree that it should be acceptable for a lower price Class A motorhome to handle poorly. I believe that no vehicle should be allowed to be manufactured and sold that cannot be properly and comfortably driven on our roads.
I guess you could say this is a chassis issue, but it's not that simple. The real issue here is that Jayco decided to build a house that was too large for the chassis. That really isn't the chassis manufacturer's fault. It's Jayco's fault.
Now, how to prove it, and how to get anything done about it.
Jim