Filling fresh water tank before trip, good or bad?

I always travel with a full tank when going to a park that has no water hookups.

Most have water available so I also carry 2 empty gallon bottles and a homemade funnel so I can refill when needed, if I can't get a hose and water thief on them, most times the water spickets are a long ways from the camp sites.

With a 30 gallon fresh water tank and 36 gal black and 34 gal grey tanks I have plenty of room.