Ha! It's completely up to you, man! If we were doing this in the near future, I'd suggest the car, because the grass is really, really, reallly dead. Crunchy dead. I think I saw a Bedouin herd some camels through the other day. Yeah, right there past the cacti.
I can't water it 'cause our well is old and barely adequate for daily use, which might make it interesting when y'all want to take showers. But hopefully we'll get some rain within the next month and a half.
But no, seriously, whatever you're most comfortable with is fine.