I have a GTPE and only test drove that trim, so I cannot compare to regular GT or other trims...my 2c is ...
However, there is still some bounce over specific types of road imperfections, for example closely spaced manhole covers that are recessed below level pavement grade. I had a Jeep...
Good thing is SF metro rarely gets colder than 45 F in winter and even if it does it is not sustained for any significant amount of time, mostly overnight temps but in day time 50 to 60.