50A RV receptacle in SFD load calc

[tortuga]

What do you all use for a RV receptacle in a standard calculation (220.40) for a single family dwelling?
I have always used 551.73 (12kva)
Recently is has been suggested I use 220.14(A) for a SFD with a known RV load, and part VI of 551 is 'only' for RV parks.
In this case the 12kVA for 50A the RV recept is putting the feeder over size, and the load from the owners RV is 3.6kva.
Now in theory an EVSE could be plugged into a RV receptacle so going by the 2023 NEC 220.57 I could go with 7200 VA.
Thanks in advance

 

[suemarkp]

Can you use the optional calculation (entire dwelling, 100A or greater capacity feeder)? That would put a 0.4 factor in front of the 12KW load. If this is a feeder that serves only some of the dwelling, then you are stuck with the standard calc. If the customer thinks the RV's won't ever draw more than 40A, then put that RV outlet on a 40A circuit instead of 50A. That will save another 2400 watts. Calling it an EVSE outlet is a good trick too!