Well I havent taken mine on overnight trips yet. But She has been out with me for 6 hours plus. Just keep the travel time temps warm enought by letting the car heater run, using hot water bottles or rice bags. Also allow about 2 hours basking time when getting to the destination and dont feed live feeders if you guys will be going to sleep directly upon arrival. They need about 1-2 hours before lights off to digest the food.
Big rubbermaid containers do well as temporary vivs, put a towel, newspaper, paper towels in the bottom and a log/rock or whatever you like. Attach a clamp lamp for heat and take out for some natural UV during the day. Or if you can, get a small UV bulb to leave at the other location for visits.
The whole rubbermaid setup can be packed up and put the lid on when youre not there. Store till the next visit.
Since its your parents house, maybe you can get a small viv 20 gallon or so. Then you can make a double duplicate setup for visits (seeing you do it 2x month every month) . All youll need is to store it in the garage or somewhere if it cant be kept in the house and If your parents dont mind. Eventually the 2 will see these visits as part of their routine and wont be bothered anymore.