Welcome to ETS RNewcomb!

Nice list. Mine is similar but I also include a tarp/tent, a change of clothes, sleeping bag and a couple of wool blankets, along with a couple of sleeping pads. I keeps lots of water under the seats and a can to start a fire or melt snow/boil water in. Thanks to Dagny's sage advice, I now keep a small battery powered AM/FM radio in my Jeep too. A backpack to carry it all in is nice too if there's a change you'll have to abandon your vehicle.

Some mechanics gloves are nice too, if you have to do any roadside repairs.