We have found that the I75 route is the best winter route from Toronto (compared to the centre or eastern route)- have used it many times. The highway is relatively flat with only the one mountain and that is usually south of the snow area- although you can get snow and ice if the conditions are right. I would not consider this mountain a problem for either the ascent or descent compared to other mountains. Simply gear down and practise the proper braking technique (don't ride the brakes- slow right down and then let the vehicle run until the speed builds up and then repeat) and you should have no problems. Your vehicle should have no issues with this area. Heavy trailers with inadequate tow vehicles could have a problem, but this is not relevant to your situation. Just relax, take your time and enjoy the view.
If you want to be entertained along the route, buy the "Along the Interstate 75" by Dave Hunter. It gives you mile by mile information on the highway, proper lane position, fuel locations and brand, hotels, restaurants, and nearby attractions. We still enjoy using our old copy even though we have driven the route many times.