In summer times when temperatures are deadly you need to have lots of water for your cat to drink and make frequent stops to make sure your cat is all right. Perhaps planning ahead to stay in places where there are motels nearby so that both you and your pet can be safe. Make sure to bring its medications and consult with your cat's veterinarian just to be sure the cat can survive such long trip. Its also depens on the age of the pet in question, and how well he/she travels in a carrier. Make sure to have your cat ID tags and have a implated chip of any pet. Also records too. Along with the weather.