Some folks just seem to have to slam doors and dogs seem to have to bark, Not a lot you can do about either.... I spent many years trying to change a couple of bad habits (Like overloading a cloths dryer and door slaming) to no avial.
Oh well, My problem has been solved.. Kind of which it had not been but that's a topic (Already covered) in another thread.
One thing you can do is this.. Fire up your air conditioner, If you do not need COOL or have limited 120vac, use FAN mode and put it on high.
This will mask much of the noise coming from outside the RV. Not completly hide it and things like a barking dog will still get through.. Just not as loud. the noise of the A/C will quickly be flitered by most minds so you do not get bothered by it.
This does have a downside though... I often can no longer hear mine unless I specifically go to the room the A/C is in and listen for it.. My mind is "Blocking" the sound of the blower .
NOTE: This is also the answer for those who complain about how LOUD the A/C is. if you run the fan on HIGH (not AUTO) you quickly block the sound mentally.
How quickly.... Depends on how good you are mentally (Now least you think I'm bragging, I've lived in this motor home over 4 years. I would hope none of you need 4 years (I did not originally, but the longer I live here the quieter that blower gets).