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You'll be spending a lot of time charging at that TT-30, since it's only 120V (2.8 kW charging @ 24A/120V). There is no adapter available for it from Tesla but several others have manufactured them and offer them. Search for Tesla TT-30 charging adapter.
Your best bet is to ask them if they have 50A RV service. If they do, use your NEMA14-50.
Otherwise, many stores sell TT-30 to NEMA 5-15 dogbones so that you can use your 120V adapter from Tesla, that will slow your charging to 12A though.
As others have said, TT-30 is only 120V, and Tesla doesn't make an adapter.
While many RV parks offer 50A service via a 14-50, there are some that only have TT-30s avail.
We're doing a big road trip this summer. While we're mostly going to use Superchargers or have J1772 avail for destination charging, we have one stop with limited charging options. I bought Tesla's 5-20 adapter (which will charge at 120V/16A or about 4 miles of range per hour). I also bought a TT-30 to 5-15/20 adapter just in case. Still won't be able to charge at more than 120V/16A, but I figured its good to have as a backup...
Here's the adapter on Amazon: Amazon.com : Conntek 14340 RV Pigtail Adapter RV 30 Amp Male Plug To 15/20 Amp U.S Female Connector : Rv Power Cord : Patio, Lawn Garden
On a similar note, what is the experience like, if you are just using a 50 amp hookup for a few hours at an RV park? Do they charge you to come on the property? Do you just drive around looking for an open spot, and plug in? I'd imagine most folks in their RVs see some model S rolling up and are like 'what the heck is this idiot doing?'
Do you call ahead and just say, 'hey i need to use your 50 amp for a few hours, what do i need to do?' I'd imagine that park manager would think that is totally bizarre,,,no?
My parents also have a weekend house
(the dryer outlet isn't reachable, even with an extension cord)...