Carrying a Portable Waste tank

I purchased one some 30+ years ago and used it when we took the Scout troops out for the weekend. We were the base, they slept in tents...unfair but it worked for me. Empty the blue tank with wheels is light weight. We only used it for gray water, I would think using it for black would really be messy, even with the best for care. It can easily be strapped to a ladder, across the tow-bar, or to a bumper. It is so light weight you can even stuff it between the bikes (assuming you have cheap family bikes).
Happy Trails.