I often wonder how RV Dealers/Salesstaff portray the features of their products when dealing with first time buyers.
By definition, a Class A Gas Motorhome is not a Coach. A Coach is defined as follows:
Motor Coach
A vehicle that is built upon a commercial truck or bus chassis. Not just a motorhome, these are the higher end of mobile living. These include conversion buses.
A Diesel pusher is night and day different, in both ride and handling. As previous posters have said, get a DP if you want a smoother ride, if not, work to add some of the other handling packages available for Gas Motorhomes. I hope you get your concerns worked out.
As a side note, RV.Net really should have two categories for posting on this site. One for DP and one for Gas powered Motorhomes. I can imagine there is much confusion for newbies seeking advise, and hoping to apply a posted "fix" for their gas motorhome, that may only be applicable to a DP.