Here are a couple of "google search pictures" of 2003/2004 Tailgator trailers. It looks like the same arrangement of two fresh water fill ports is on both of these trailers as well. My guess would be that there are two fresh water tanks, probably installed side by side and both connected by small tubing to the water pump. This would eliminate the need for one "large, easily overstressed tank" and allow for better weight/balance with two smaller tanks. The two fill ports are necessary for that kind of arrangement because a small "gravity fed tank connection" would not flow water fast enough between the two tanks to allow easy filling from one port.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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