Ahh that's amazing! Congrats Zoom!
I'm sure he'll be warm enough... your pup has lots coat and the car will stay warm as it's a small space and I'm sure you'll run the heater when you're driving and you can give him lots of bedding. Not quite the same, but I raised Roman outside in autumn and I never saw any indication he was cold.
Really, you just need the stuff you'd need for an adult dog... crate, bed, chews, balls (maybe smaller balls? not sure how big his mouth is), tugs, treats, poop bags, a little collar and a longline.