Does anyone travel with a house cat?

Hi all, we will be taking our 'house' cat with us to Spain in April and returning in June. By 'house' I mean he does not go outside on his own. Whilst he is used to the high temperatures in Spain right throughout the year living in a house this will be his first time in a motorhome. He loves the very hot sun but we would welcome any personal experiances from anyone who has spent time with a cat in a caravan/motorhome in June temperatures with regards to how the cat coped with the environment. Ours is a Devon Rex with little or no fur in places and the breed feels the cold but loves the heat. Regards, Roy