You will likely just have the overflow tube next to your fill pipe.
Then underneath the trailer, most units have a pair of hot and cold "low point" drains, one blue for cold and one red for hot, primarily for use for draining water from your water lines and winterizing your unit. Then you will likely also have a fresh water tank drain which is usually a swivel valve of some sort.
The oveflow for your fresh water tank is not usually a separate drain underneath the unit.
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2014 Rockwood Signature 8282 Ultra-Lite
2008 RAM 3500 HD DRW Laramie Megacab
6.7 Cummins Turbo Diesel
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