The blankets should have a sleeping bag to go inside of, and people who live in snow need to keep extra socks and some sweats to sleep in, in between getting in and out of the car (and getting wet), at the very least.
Without getting into all the big list for survival and all that, what you and I mentioned should be a minimum.
Start with the sleeping bag,the blankets are the extra.
I agree with your sleeping bag requirement.
Why a plumber’s candle? They last a certain amount of hours, between 6 and 8.
http://www.wilderness-survival.net/forums/archive/index.php/t-10433.html