You will either use a MASSIVE amount of water pushing poo all the way to your truck, Or you will need to put the black tank DIRECTLY below the toilet. even a very efficient modern toilet uses over 2 gallons a flush, and the septic is completely below the level of the toilet. RV tanks use very little water and they dump straight down into the tank. Effectively it's an out house with a vapor barrier. They make a holding tank cart that you can dump into and tow it to the dump station with a golf cart or your truck. It's a much easier solution.
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