I carry a 25' & 50' water hoses and only needed longer than 25' once, so glad I had the 50'. As for electrical, besides the 25' 30A electrical cord that is installed in my TT, I also carry the 50' 30A I use at home when I need to plug into the dedicated 30A connection at my house, I have needed the extra length a few times. If I were buying specifically for campground use, I would get a 25' hose which will serve you well in most instances, a 10 to 15' length hose for the few times when extra might be needed and a 25' electrical cord as an extra in case more length is needed.