Would help if knew which model you have.
1. A/C noise different if venting out directly from the unit or sent thru the ducts to various parts of the camper.
2. My camper did not come with a water pressure regulator, however, I did purchase an aftermarket one, fixed installation, where the water connects to the camper. It works fine and no loss or difference in pressure either way.
3. Does not apply
2012 Fun Finder XT 276 Toy Hauler & Harley Davidson Ultra Classic with Condor wheel chock
2014 Dodge Ram 2500 AT 4X4 Crew Cab 6.4 L Hemi, 373 gears, tow package, Rambox option, Revolver X2 tonneau cover, Equal-I-zer anti-sway hitch.