HI There;
The Hubs are not designed to run "HOT". When you speak of hot, is it hot enough to burn your hand? If it is, there is something wrong with them. I have the Warn Manual Hubs and they get warm, but ever so slightly even after long hours of driving.
What I think you're feeling is the heat generated through conduction from the brake rotor. Because you drive an automatic, you will be using your braked than someone who drives a standard(which I do ).
The heat from the rotor will conduct throgh the lugs and the wheel itself and eveb through the old hubs.
If the heat is being conducted through the rotor, you have probably have nothing to worry about. Service your hubs once a year and make sure they properly greased(Note:DO NOT PACK THESE HUBS IN GREASE). If the heat is being generated by the Hubs, TAKE THEM OFF IMMEDIATELY. You don't need a burned out CV shaft and a burned out hub at the same time.
Hope that helps
BlackX
Hope this helps