I use a FloJet Macerator pump to dump that way... Was camped for a week at a state park in Massena NY this Summer, and the dump site was more than a mile away, across a bridge... Towing a tote on its wheels, behind the truck, like so many do, wouldn't have worked. Pumping into the tank worked fine.
Before I did it "for real" I had filled the gray tank with tap water (at home) then tried I out just to make sure that I had all the necessary fittings, etc... I found that adding a slide gate to the tote made it a much safer operation, but i needed a double male connector to do that.....
Be Safe, and Everyone Goes a 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