I have a 42-gallon tote, but often dry camp too far away from a dump site to tow it behind, as designed. I just put it in the back of the truck, and use my macerator pump to pump off my tanks, as needed, and I don’t have to move the trailer for either grey or black tank dump.
If you are just going to move grey water this way, you can get a 12v liquid transfer pump fairly inexpensivly at Tractor Supply or Northern Tool. This allows you to,pump the water to your tank, so that you don’t have to lift a filled tank into your truck. After two major back surgeries, I’ve had to learn how to camp without further injuring myself....
Be Safe, and Everyone Goes Home,
2014 RAM Laramie 2500 w/6.7L Cummins Diesel and Automated Safety Hitch
2016 377RLBH Jayco North Point
300W of Suntech Solar w/Rogue MPPT Controller & Xantrex 2000W PSW Inverter