Hi
Not to keep you from buying a new toy
... but ... switches generally are a dirt cheap item to replace. Most of them are a generic size and type.
The biggest debate on jack replacement seems to be "how big?". At the very least, you are lifting the tongue weight of your trailer. With some WD hitches, some people also lift quite a bit more than that.
Just for reference, AS seems to have gone to 4,500 lb jacks across the board this year.
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Leaping ahead to tomorrows question - the galley faucets seem to be pretty standard residential units. Lowes and Home Depot will happily sell you a wide range of ones that *should* fit. Going over and actually seeing the options probably is a good idea. Oddly enough, the faucet in our trailer is identical to the one in our kitchen here at home ....
Bob