Conduct all your support crew business at the car. Do not carry clothes, batteries, waterbottles, supplies, etc. into the controle area. This is considered a faux pas. A true Randonneur does not require support. PBP controles are designed for unsupported riders.
Crews are welcome to use the facilities and buy food at the controles.
The food is expensive but it is home cooked, hot and delicious. Don't dilly dally. Get gas before it gets dark. Always set an alarm. It's embarrassing when your rider finds you asleep in the car.