Overland, your cousin might consider a four or five foot easily drained , and easily reached hose, joined to a longer hose.
12 foot works in the thoughtfully laid out campsites. Carry two. Or a twenty five. Live off the tank.
Our worst experiences have been in Canada. Power trees , shared, sometimes 100 ft away, but we could borrow a cord at the office... In provincial parks if we needed power
Not usually a big deal for us, as we fill at a central spit, and live off solar, as we do at home. I can count on one hand the number of times we've actually used a powered or water site, in nine years.
Sherry