Does vehicles' navigation support towing setup?

Not that I know of although it would be nice.

It would also be nice to have something similar to what Cummins and Eaton are doing in the heavy duty trucking industry for those that like the vehicle to do everything. The GPS is integrated with the ECM/TCM so when it detects you are coming upon a hill it will automatically down shift or build boost right before you get there so you don't lose as much speed(and fuel economy) going up. It also does something similar on the way down.