Just remember that water weighs 8.3 lbs. per gallon. Just the 27 gallon container full would weigh 224 lbs. If you have to pull that by hand in sand or over rough ground before you hook it up to your truck, that could be a chore. And many portable totes you have to lift 1 end to empty it. Of course you don't have to fill it up all of the way when using.
We opted for a 15 gallon tote....a Tote-N-Stor. Doesn't take up a lot of room in the truck bed, and it weighs only 124 lbs fully loaded. Even at that, dragging across sand to hook it up to the truck was hard to do.
You can always make 2 or more trips to the dump station.
Chap , DW Joy, and Fur Baby Sango
2006 Ford F150 Super Cab 4x4
2008 Surveyor 263