If it is frozen, just run your (furnace) heat as much as possible, try skirting that area with hay bales to block the wind, just make a square around the bottom of the trailer where the tank is, you might drop a section of the black under cover, and slip a drop light under the tank close to the dump side.
My old 30' trailer had a tissue blockage, I dropped an air hose down the toilet, packed the toilet hole with rags and gave it a blast of high pressure air and...whoosh! out the blockage came.
Good luck with it.
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