Absolutely none at all.
If you are taking Hwy 1 from Banff, it is the main route.
We travel all of southern British Columbia on all the highways with a 36' motor home and pulling a car with no problems.
Only thing you have to remember in British Columbia is .... we have hills. Most of the grades on our highways run around 8% which is a little steeper than the 6% down south.
Use the gear to go down, that you used to go up.