We tent camped from Alaska to Nevada last year, and we used the G-tube/feeding pump every night. We would charge the pump with an inverter in our truck during the day while we were driving, and at night she was set to get her feedings. We even drove through a couple of nights without stopping, and the two kids slept in the back seat while she got her feeding which was hung on the car door's utility hook. This particular trip was too long to take a "break" so we just made it work because our daughter doesn't feel well without her feedings. She gets very tired and run down without it. I can understand why you would want to skip it, and it sounds like your son can do that without any trouble so do what you feel is best. I just wanted to let you know we have done it in campers, tents, cars, etc. so that you know CF doesn't have to get in the way of your vacation plans. We are going to FL in a few days on vacation too!
Best of Luck to your family