Agree it's best to leave him home...snakes don't need the stress of travel, especially long trips. You'd also run the risk of having car trouble, let's just say, & having
the trip take longer than expected. If you ever DO want or need to transport your snake(s), they do very well when bagged securely in cloth bags (or pillow cases)
and then put in an "ice chest" (or insulated styro-foam box, like live snakes or food is shipped in) with either a tiny air hole or periodic brief opening for fresh air (about
every 8 hours), or just a small wad of tape to prevent the lid from closing tightly is very easy too. To keep a snake warm on the trip, you can use a bottle of hot water
(it will last about 8 hours) or a chemical heat-pack as used when reptiles are shipped by air. Either way, make sure the heat source is wrapped so the snake is not in
contact with excessive heat, ever, during the trip. The cloth bag containing the snake will help but always "err on the side of safety". I've moved cross country with a
number of snakes traveling this way...they all did great, & seemed relaxed about the whole thing. I checked them & gave them water when I stopped each night.