RV TT-30 to EV 14-50 Adapter

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The site EVSEAdapters started making Tesla-like adapters that plug into the body of the mobile cable, and they have the sizes resistors in them that create the amp signal that the charge cable uses. Here is the one for a TT-30 that will tell it to use the appropriate 24A.
TT-30 Adapter for Tesla Model S/X/3 Gen 2

I have that adapter and use it regularly. It sets the proper maximum amperage and works great. It's looks and feels just as good as the Tesla pigtails.