I had a 25 gallon, 2-wheeled version of one with the side discharge gate when we had the TT and used the State Parks with only electric hookups. The TT only had a 30 gallon black tank and using the tote made it easy to extend our stays and not wait in line with a bunch of impatient hot shots at the dump station when we would leave. Problem with it was the low profile of the TT made it necessary to dig a shallow trench under the sewer connection to get the tote in place. Sold it to a friend with a smaller TT last year since it was sitting in my garage for several years unused.