I asked this company a question below is answer.
The NEMA 14-30 plug operates at 24 amps (80% of 30 amps) with a Tesla UMC / Mobile Connector / JESLA.
You can buy one here:
The 14-30R to 10-30P adapter does not require any resistors.
Quick Charge Power LLCTonyWilliams@QuickChargePower.comwww.QuickChargePower.com
1-844-387-2787 ext 701 pop
Easy solution, if not sure contact the folks, they respond quickly
Ask your electrical questions.
You'd need the Tesla 14-30 adapter for this, but no need to dial down the amps. Good idea, since they added that adapter recently. Maybe I'll buy this cable and two of those adapters for when my 10-30 adapter fails some time in the far future, hopefully.
Any questions about the adapter email them, my response time was under 90 minutes from the site.
Great way to do your 10-30......
Every month or three the same questions appear.