Best Water Bladder for Dry Camping?

Water bladders are nice, but hard to air dry and keep clean unless one has a rack to have it inflated so every nook and cranny is exposed to air. I generally prefer hard-sided tanks, but there is something to be said about pumping 50+ gallons of water into a bladder in a truck bed, then let gravity do the filling (assuming the bladder is higher than the water fill on the RV.)