hi @Ron-Z
I too use an Oukitel RT3 rugged tablet, no case, no anti vibration mount, it all works perfectly well for me, the tablet performs very well in bad weather, never had a problem in the rain.
obviously it's android, but again MRA works seamlessly and most of the time i use offline mode, with downloaded maps.
FYI i do not have any other apps running on the tablet, nor do i have a SIM card, so can only get online if i tether to my iPhone, it is purely for navigation, i do get almost all day battery, and if not i attach a USB c lead to the bike socket.
i have no issues using touch screen, but obviously your gloves would have to made for this function.