Fresh water holding tanks in RV's are usually not fiberglass. Plastic welding usually works, but the leak may be a fitting connected to the tank.
Some people drop part or all of the belly cover. Some cut a flap leaving a hing on the front side of the flap. Seal it after work is complete using high strength all weather tape.
However, the location of a leak and the source of the leak are often not near one another, so at least dropping part of the cover will allow you to find the source.
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Paul Bristol
Dutchman Kodiak Cub KD176RD 2018
Nissan Pathfinder 2015
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