In my time in the Air Force I was Detachment Coordinator and Imprest holder many times.
There is a major problem with putting crews in simple hotels and B&B's.
The user normally likes the detachment crew to be fully flexible and able to operate short notice.
Try calling a crew at 10pm saying you want them to start work in two hours with say 45 pax. The imprest is locked in the safe until morning, the aircraft water flasks are empty and there are no rations for a long working day.
Just like with the Hotac there are GASO's which state how much food and water must be carried for the task.
Big 24 hr manned hotel. All the problems go away.