I didn't read all the comments so I apologize if I'm duplicating. I usually will intentionally park with the slide side slightly lower if it's wet out. Also, hook up the TV before you put the slide in. Raising and lowering the RV will allow most of the water to run off.
Noisy water pumps are often caused by vibrating water lines. Try to find the vibration and either add some clamps to secure it better or fit it with some pipe insulation.
2012 Eagle Super Lite 266 RKS, 2004 Silverado K1500