Benefits and Convenience
Toilets are a necessary evil when using a travel trailer, unless you want to stop every few miles to use the facilities. If you're camping overnight, it's much more convenient to use the toilet in your travel trailer than it is to have to go bumbling through the wilderness in the middle of the night looking for somewhere to go. The function of travel trailer toilets has been somewhat of a mystery for some people. In reality, the mechanics of a travel trailer toilet aren't that hard to understand.
Mechanics
The first thing to understand is that there is a tank of fresh water attached to the underside of a travel trailer. Every time the toilet is flushed, about 2 quarts of water runs through the toilet. After each flush, a small amount of water stays in the toilet. In addition, there's another tank known as the black tank. When the toilet is flushed, seals in the valve for the black tank and seals in the toilet work together with the chemicals used for odor control to keep odors from escaping and invading the travel trailer. For this reason, keeping the seals in proper working order is paramount in avoiding unpleasant bathroom odors.
Understanding the Water Flow
Travel trailers also have what are known as holding tanks. One of the holding tanks holds clean water while another holds waste. When the toilet is flushed, the waste goes into the black tank for disposal at a later time. Running a hose from it to the disposal site, via a valve, can empty the black tank. It's very important to keep the valve on the black tank closed when it's not being emptied; otherwise the toilet system could become clogged. One-ply bathroom tissue is also needed in order to keep the toilet system of a travel trailer working properly. If two-ply tissue is used, the system can easily become clogged. Chemicals, such as those used in port-a-potties, are also used in travel trailers' tanks to help break down the waste and turn it into a sludge that can be easily emptied at a later date.
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