You should be able to do this all from the outside. there should be 3 or 4 screws holding the hose bib to the trailer.
Take those screws out and gently pull on the assy to get it free of the traielr wall.
This will expose the connection between the hose connection part and the trailer plumbing pipe, probably PEX.
With this exposed attach the hose and turn on the water and check for leaks at the connection point.
Now this may be of several types of connections, but you should be able to fix it possibly by just tightening a threaded connection if it like mine.
Good Luck
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