Many coaches of that age did not come with a whole house filter. If it did, it would be obvious in the water compartment. What I'd look at is the screen on the shore water input. If it's all gummed up with crud, or if a portion of it had broken off and got pushed into the inlet pipe, that would give you your symptoms. There is also a 'back-flow preventer' that could be stuck, again right there at the shore water inlet connector.
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