A short test drive on a calm day isn't much of a test. Spend at lest an hour, get it out on the interstate and see how passing trucks affect you. Merge onto a highway with your foot to the floor. Find a decent hill or two to climb and then seek out some rough roads and tight gas station entrances with steep dips.
Any coach that cannot successfully pass a proper road test is the wrong coach... probably. If you test drove and expensive SUV and it handled badly would you still buy it? An RV is going to cost a lot more so why buy if you have to do anything beyond alignment and proper tire pressure?
As always.... Opinions and YMMV.
:C