We live in British Columbia (Vancouver) and are heading to southern CA/AZ for our winter months (Nov to Feb). We understand that the mountain passes along the I5 thru CA/OR can be an issue at times and we were wondering if anyone had any experience with this? We would like to start heading south at the beginning of November and drive back in March. Do you think we'd have any weather problems in November or March? We could change our plans to travel in mid-October and late-March but would prefer not to. Many thanks for any feedback.