My trailer has a cassette toilet and a 20gal fresh tank and 20gal grey. I got a 6gal grey tote and 4 2.5gal aquatainers. They are light enough full that I can tote them across a campground. They store easily inside the camper when traveling and then I store them underneath it while at camp.
I do use the campground facilities as much as possible. 20 gallons fresh water doesn't get you many showers.
As my trailer is a folding trailer, using a tote is a lot easier than having to put everything away for travel, drop the roof, hitch up, tow to the dump, and then relevel, unhitch, raise the roof and get comfortable again.
