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Best charging solution if I already have an RV outlet.

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You already have everything you need. The Tesla will come with a 14-50 adapter plug and this is the same as an RV plug.
Not necessarily. The 120V TT-30 plug is also called an "RV plug." If that's what the OP has, then an adapter will be needed.

Check this handy chart to see what kind of RV outlet you already have. If it's a 14-50 then you're good, as KJD said.
 
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This is what it looks like. The 14-50 looked different to me.
 

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This is what it looks like. The 14-50 looked different to me.
That's an L14-30 outlet, so you need this adapter. Also, and this is very important: you will need to manually set the charging rate (on the charging screen in the car) to 24 amps. That's because third-party adapters don't have a way to tell the car it should avoid trying to pull 40 amps, so you need to set the rate yourself or you'll trip the breaker (if you're lucky).
 
Don't do it. Have a properly wired 14-50 outlet installed. Adapters are fine for occasional use when traveling, but it's best not to use them for your daily charging at home.
This is really the best advice. Any adapter which connects a higher-amperage plug (50A) to a lower-amperage receptacle (30A) is not code-compliant, and is only for temporary use in a situation where you make certain you restrict the load to less than the outlet can supply continuously (in this case, 24 amps.) It'll work just fine, until that one time when it doesn't.
 
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If you can get hold of a Nema 14-30 Tesla adapter for your UMC you could change the receptacle to a standard Nema 14-30.

Another option would be to take a look at the wire already in place. If you are lucky and someone oversized with 6/3 than you can change the receptacle and breaker.
 
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As a couple of people have mentioned using a pigtail to switch from the 50 to the 30 is not good for daily use. @TexasEV mentioned installing a 14-50 outlet, but that may (probably will) be more complicated, with having to pull and re-run new wiring through walls, etc. What you could do, which would be a cheaper and more simple install is to remove the outlet, and mount a wall connector on that 30A circuit. (That is assuming it's an L14-30, as @thecloud suggested.) The wall connector has settings inside to run on many different breaker sizes, so putting it on a 30A is no problem.
 
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