A/C excessive noise/buffeting

Sorry to say it sounds normal to me. Ours isn't ducted and is right in the center of the living area. Makes it hard to even hear tv. We just replaced the a/c as ours died and the new one is a little bit louder than the old one. They claim it's quieter Bxxxxhit.

yep the make alot of noise .

Atwood used to make relatively quiet A/Cs, but Dometic bought them and put an end to that nonsense. They are all pretty noisy.

Loose bolts,unbalanced fan due to dirt dobber, several reasons for this extra noise

Shouldn't be that way. Do you have wasps that make dirt nests in your area? Probably the reason, they made a nest on one of your fan blades.

The inside uses a squirrel cage fan. It could have sucked up a piece of paper or something inside the wheel. That would throw it out of balance and make it shake.

The outside fan uses a regular fan blade that mud daubers love to build their nests on. They're really make it shake.

You'll have to take a look at both of them. The noise, I can't help with - sorry.

RV A/C are noisy especially when compared to a home unit; but they should not have excessive vibration. As others have said something making the fan or blower wheel out of balance.

2015 Solaire 220X - a/c has been noisy from day 1. I'm guessing that's just the way it is.

Before I went too far in trying to figure out the problem, I'd pull the shroud and check for wasp/dirt dauber nests on the fan blades. If there is a serious vibration, this is the most likely cause. When I fired ours up for the first time this year, I thought it was going to shake off of the roof. Ten minutes later after removing a good sized dirt dauber nest, smooth as ever. Would have been five minutes, but I took the opportunity to spray the coils out good since I was there anyway.

The air buffeting could be caused by the vibration since it transfers to the squirrel cage also since it is all one shaft, but it is probably just a design flaw in the duct system.

Also check the bolts holding it to the roof.