Blue tote: Used for dumping your RV tanks into and then you transport the waste to a dumping station. This way, you do not need to move the camper when the tanks are full. The 4 whee kind tows behind your vehicle. Mine has the discharge slide. Connect the same hose you use for your camper, and put the other end of the hose in the dump station hole. Pull the slide and "let it go!"
They come in various sizes. People buy them based on how much they weigh when full of liquid (some have 2 wheels only, some have no wheels). Some purchase on the size it takes to store them
I purchased mine based on the size of my holding tanks. I got one bigger than my largest holding tank in the camper. That way, it will never overfill if dumping one tank at a time.
