I assume you are living in the trailer? Connected to water? Have you checked that the water line isn't turned off? Just being logical...
If you have water pressure to the hose all the way to the trailer, then there is something in the line blocking it--could be the check valve just behind the water connection has broken and won't let water pass. No idea where the loud noise is coming from...
2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired