Does the water connector have screws in it attaching it to the trailer. If so, I'd remove the screws, remove any caulk from around the connector and pull to out to see if the hose attached the backside is water tight. Sounds like you could have a loose connection somewhere and that's the easiest place to start looking.
Days camping (2015)----88 days
Days camping (2016) ---110 days
2016 Wildcat MAXX 28RKX (33' TT), 2007 13' Scamp
2015 Ram Laramie Hemi
30 years RV'ing
12 different RV's