[Elecraft] operating HF / KX3 in a Tesla Model S

[Johnny Siu]

Hello elecrafter,
I am thinking operating my KX3 in my Tesla and have some questions:
1.  Is it ok to direct drain DC supply from the cigarette lighter socket since there is no ignition system in the Tesla?
2.  The body of Tesla is aluminium alloy (if I am correct.  How can I ground a mobile whip to the car body?
Any advice is appreciated.
73
Johnny VR2XMC